-
question_answer1)
Which of these does not influence the rate of reaction [KCET 2005]
A)
Nature of the reactants done
clear
B)
Concentration of the reactants done
clear
C)
Temperature of the reaction done
clear
D)
Molecularity of the reaction done
clear
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question_answer2)
The rate law for reaction \[A+2B=C+2D\] will be
A)
Rate \[=K[A]\,[B]\] done
clear
B)
Rate \[=K[A]\,[2B]\] done
clear
C)
Rate \[=K[A]\,{{[B]}^{2}}\] done
clear
D)
Rate \[=K\frac{[C]{{[D]}^{2}}}{[A]{{[B]}^{2}}}\] done
clear
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question_answer3)
In the reaction \[2{{N}_{2}}{{O}_{5}}\to 4N{{O}_{2}}+{{O}_{2}}\], initial pressure is \[500\,atm\] and rate constant \[K\] is \[3.38\times {{10}^{-5}}{{\sec }^{-1}}\]. After 10 minutes the final pressure of \[{{N}_{2}}{{O}_{5}}\] is [Orissa JEE 2005]
A)
490 atm done
clear
B)
250 atm done
clear
C)
480 atm done
clear
D)
420 atm done
clear
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question_answer4)
The rate law for the reaction Sucrose + Water \[\xrightarrow{[{{H}^{+}}]}\] Glucose + Fructose is given by
A)
Rate \[=K\] [sucrose] [water] done
clear
B)
Rate \[=K\] [sucrose] [water]\[^{0}\] done
clear
C)
Rate \[=K\] [sucrose]\[^{0}\][water] done
clear
D)
Rate \[=K\] [sucrose]\[^{1/2}\] [water]\[^{1/2}\] done
clear
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question_answer5)
\[A+2B\to C+D\]. If \[-\frac{d[A]}{dt}=5\times {{10}^{-4}}mol\,{{l}^{-1}}{{s}^{-1}}\]1, then \[-\frac{d[B]}{dt}\] is [DPMT 2005]
A)
\[2.5\times {{10}^{-4}}mol\,{{l}^{-1}}{{s}^{-1}}\] done
clear
B)
\[5.0\times {{10}^{-4}}mol\,{{l}^{-1}}{{s}^{-1}}\] done
clear
C)
\[2.5\times 10-3mol\,{{l}^{-1}}{{s}^{-1}}\] done
clear
D)
\[1.0\times {{10}^{-3}}mol\,{{l}^{-1}}{{s}^{-1}}\] done
clear
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question_answer6)
The data for the reaction \[A+B\to C\] is [CBSE PMT 1994]
Exp. | \[{{[A]}_{0}}\] | \[{{[B]}_{0}}\] | Initial rate |
(1) | 0.012 | 0.035 | 0.10 |
(2) | 0.024 | 0.070 | 0.80 |
(3) | 0.024 | 0.035 | 0.10 |
(4) | 0.012 | 0.070 | 0.80 |
The rate law corresponds to the above data is
A)
Rate \[=k\,{{[B]}^{3}}\] done
clear
B)
Rate \[=k\,{{[B]}^{4}}\] done
clear
C)
Rate \[=k\,[A]\,{{[B]}^{3}}\] done
clear
D)
Rate \[=\,k\,{{[A]}^{2}}\,{{[B]}^{2}}\] done
clear
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question_answer7)
The experimental data for the reaction \[2A+{{B}_{2}}\to 2AB\] is [CBSE PMT 1997]
Exp. | \[{{[A]}_{0}}\] | \[{{[B]}_{0}}\] | Rate (mole \[{{s}^{-1}}\]) |
(1) | 0.50 | 0.50 | \[1.6\times {{10}^{-4}}\] |
(2) | 0.50 | 1.00 | \[3.2\times {{10}^{-4}}\] |
(3) | 1.00 | 1.00 | \[3.2\times {{10}^{4}}\] |
The rate equation for the above data is
A)
Rate \[=k\,[{{B}_{2}}]\] done
clear
B)
Rate \[=k\,{{[{{B}_{2}}]}^{2}}\] done
clear
C)
Rate \[=k{{[A]}^{2}}\,{{[B]}^{2}}\] done
clear
D)
Rate \[=k\,{{[A]}^{2}}[B]\] done
clear
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question_answer8)
The reaction \[2NO(g)+{{O}_{2}}(g)\]⇌\[2N{{O}_{2}}(g)\]is of first order. If volume of reaction vessel is reduced to 1/3, the rate of reaction would be [MP PMT 2001]
A)
1/3 times done
clear
B)
2/3 times done
clear
C)
3 times done
clear
D)
6 times done
clear
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question_answer9)
For a reaction \[2A+B\to \]Products, doubling the initial concentration of both the reactants increases the rate by a factor of 8, and doubling the concentration of B alone doubles the rate. The rate law for the reaction is [MP PET 2001]
A)
\[\gamma =k[A]{{[B]}^{2}}\] done
clear
B)
\[\gamma =k{{[A]}^{2}}[B]\] done
clear
C)
\[\gamma =k[A][B]\] done
clear
D)
\[\gamma =k{{[A]}^{2}}{{[B]}^{2}}\] done
clear
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question_answer10)
For a reactions \[A+B\to \]product, it was found that rate of reaction increases four times if concentration of ?A? is doubled, but the rate of reaction remains unaffected. If concentration of ?B? is doubled. Hence, the rate law for the reaction is [MP PET/PMT 1998; MP PMT 2003]
A)
\[\text{rate}=k[A][B]\] done
clear
B)
\[\text{rate}=k{{[A]}^{2}}\] done
clear
C)
\[\text{rate}=k{{[A]}^{2}}{{[B]}^{1}}\] done
clear
D)
\[\text{rate}=k{{[A]}^{2}}{{[B]}^{2}}\] done
clear
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question_answer11)
Velocity constant K of a reaction is affected by
A)
Change in the concentration of the reactant done
clear
B)
Change of temperature done
clear
C)
Change in the concentration of the product done
clear
D)
None of the above done
clear
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question_answer12)
Point out the wrong statement : For a first order reaction
A)
Time for half-change \[({{t}_{1/2}})\] is independent of initial concentration done
clear
B)
Change in the concentration unit does not change the rate constant \[(K)\] done
clear
C)
Time for half-change \[\times \] rate constant \[=0.693\] done
clear
D)
The unit of \[K\] is \[mol{{e}^{-1}}{{\min }^{-1}}\] done
clear
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question_answer13)
The rate constant of a reaction depends on [CPMT 1989; DPMT 2001]
A)
Temperature done
clear
B)
Mass done
clear
C)
Weight done
clear
D)
Time done
clear
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question_answer14)
In a first order reaction the concentration of reactant decreases from \[800\,mol/d{{m}^{3}}\] to \[50\,mol/d{{m}^{3}}\] is \[2\times {{10}^{2}}\sec \]. The rate constant of reaction in \[{{\sec }^{-1}}\] is [IIT-JEE (Screening) 2003]
A)
\[2\times {{10}^{4}}\] done
clear
B)
\[3.45\times {{10}^{-5}}\] done
clear
C)
\[1.386\times {{10}^{-2}}\] done
clear
D)
\[2\times {{10}^{-4}}\] done
clear
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question_answer15)
For a reaction \[A\to B\], the rate of reaction quadrupled when the concentration of A is doubled. The rate expression of the reaction is \[r=K{{(A)}^{n}}\]. when the value of \[n\] is
A)
1 done
clear
B)
0 done
clear
C)
3 done
clear
D)
2 done
clear
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question_answer16)
The velocity constant of a reaction is K. Which of the following statements is not true regarding K
A)
K is a constant for a reaction at a given temperature done
clear
B)
The value of K changes when the temperature changes done
clear
C)
K is the velocity of the reaction at unit concentrations of the reactant done
clear
D)
K is a constant for all reactions done
clear
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question_answer17)
For the following reaction scheme (homogeneous), the rate constant has units : \[A+B\xrightarrow{K}C\] [MP PET 1999]
A)
\[{{\sec }^{-1}}\,mole\] done
clear
B)
\[{{\sec }^{-1}}\] done
clear
C)
\[{{\sec }^{-1}}litre\ mol{{e}^{-1}}\] done
clear
D)
sec done
clear
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question_answer18)
Which of the following oxides of nitrogen will be the most stable one [NCERT 1978]
A)
\[2N{{O}_{2}}(g)\]⇌\[{{N}_{2}}(g)+2{{O}_{2}}(g);K=6.7\times {{10}^{16}}mol\,{{l}^{-1}}\] done
clear
B)
\[2NO(g)\]⇌ \[{{N}_{2}}(g)+{{O}_{2}}(g);\,K=2.2\times {{10}^{30}}mol\,{{l}^{-1}}\] done
clear
C)
\[2{{N}_{2}}{{O}_{5}}(g)\]⇌\[2{{N}_{2}}(g)+5{{O}_{2}}(g);\,K=1.2\times {{10}^{34}}\,mol\,{{l}^{-5}}\] done
clear
D)
\[2{{N}_{2}}O(g)\]⇌\[2{{N}_{2}}(g)+{{O}_{2}}(g);\,K=3.5\times {{10}^{33}}\,mol\,litr{{e}^{-1}}\] done
clear
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question_answer19)
The rate of reaction is determined by slow step reaction. The step is called
A)
Reaction rate done
clear
B)
Activation step done
clear
C)
Rate determining step done
clear
D)
None of the above done
clear
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question_answer20)
The rate of the reaction \[CC{{l}_{3}}CHO+NO\to CHC{{l}_{3}}+NO+CO\] is given by Rate \[=K\,[CC{{l}_{3}}CHO]\,[NO]\]. If concentration is expressed in moles/litre, the units of K are [MP PET 1993]
A)
\[litr{{e}^{2}}\,mol{{e}^{-2}}\,{{\sec }^{-1}}\] done
clear
B)
\[mole\,litr{{e}^{-1}}{{\sec }^{-1}}\] done
clear
C)
\[litre\,mol{{e}^{-1}}{{\sec }^{-1}}\] done
clear
D)
\[{{\sec }^{-1}}\] done
clear
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question_answer21)
Rate constant for a reaction \[{{H}_{2}}+{{I}_{2}}\to 2HI\] is 49, then rate constant for reaction \[2HI\to {{H}_{2}}+{{I}_{2}}\] is [Bihar MEE 1997]
A)
7 done
clear
B)
1/49 done
clear
C)
49 done
clear
D)
21 done
clear
E)
63 done
clear
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question_answer22)
The reaction \[{{N}_{2}}{{O}_{5}}\,(\text{in}\,CC{{l}_{4}}\,\text{solution})\to 2N{{O}_{2}}(\text{solution})+\frac{1}{2}{{O}_{2}}(g)\] is of first order in \[{{N}_{2}}{{O}_{5}}\] with rate constant \[6.2\times {{10}^{-1}}{{s}^{-1}}.\] What is the value of rate of reaction when \[[{{N}_{2}}{{O}_{5}}]=1.25\,mole\,{{l}^{-1}}\] [AFMC 1998]
A)
\[7.75\times {{10}^{-1}}mole\,{{l}^{-1}}{{s}^{-1}}\] done
clear
B)
\[6.35\times {{10}^{-3}}mole\,{{l}^{-1}}{{s}^{-1}}\] done
clear
C)
\[5.15\times {{10}^{-5}}mole\,{{l}^{-1}}{{s}^{-1}}\] done
clear
D)
\[3.85\times {{10}^{-1}}mole\,{{l}^{-1}}\,{{s}^{-1}}\] done
clear
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question_answer23)
A reaction that is of the first order with respect to reactant A has a rate constant \[6{{\min }^{-1}}.\] If we start with \[[A]=0.5\,mol\,\,{{l}^{-1}}\], when would \[[A]\]reach the value 0.05mol \[{{l}^{-1}}\] [KCET 2000]
A)
0.384 min done
clear
B)
0.15 min done
clear
C)
3 min done
clear
D)
3.84 min done
clear
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question_answer24)
The rate constant for the reaction, \[2{{N}_{2}}{{O}_{5}}\to 4N{{O}_{2}}\]\[+{{O}_{2}}\] is \[3\times {{10}^{-5}}{{\sec }^{-1}}\]. If the rate is \[2.40\times {{10}^{-5}}mol\,\,litr{{e}^{\text{-1}}}{{\sec }^{-1}}\]. Then the concentration of \[{{N}_{2}}{{O}_{5}}\](in mol litre-1) is [IIT Screening 2000]
A)
1.4 done
clear
B)
1.2 done
clear
C)
0.04 done
clear
D)
0.8 done
clear
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question_answer25)
For the reaction \[2{{N}_{2}}{{O}_{5}}\to 4N{{O}_{2}}+{{O}_{2}}\]rate of reaction and rate constant are \[1.02\times {{10}^{-4}}\]and \[3.4\times {{10}^{-5}}{{\sec }^{-1}}\] respectively. The concentration of \[{{N}_{2}}{{O}_{5}}\] at that time will be [BHU 2001]
A)
\[1.732\] done
clear
B)
3 done
clear
C)
\[1.02\times {{10}^{-4}}\] done
clear
D)
\[3.4\times {{10}^{5}}\] done
clear
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question_answer26)
The rate law of the reaction \[2{{N}_{2}}{{O}_{5}}\to 4N{{O}_{2}}+{{O}_{2}}\] is [MP PET 2002]
A)
\[r=K[{{N}_{2}}{{O}_{5}}]\] done
clear
B)
\[r=K{{[{{N}_{2}}{{O}_{5}}]}^{2}}\] done
clear
C)
\[r=K{{[{{N}_{2}}{{O}_{5}}]}^{0}}\] done
clear
D)
\[r=K{{[N{{O}_{2}}]}^{4}}[{{O}_{2}}]\] done
clear
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question_answer27)
If \[R=K{{[NO]}^{2}}[{{O}_{2}}],\] rate constant may be increased by [BHU 2003]
A)
Increasing temperature done
clear
B)
Decreasing temperature done
clear
C)
Increasing concentration of \[{{O}_{2}}\] done
clear
D)
Increasing concentration of \[NO\] done
clear
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question_answer28)
The value of rate constant \[A+B\to \] products depends on [BHU 2003]
A)
Concentration of A and B done
clear
B)
Pressure done
clear
C)
Temperature done
clear
D)
All of these done
clear
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question_answer29)
The rate constant of a reaction depends upon [BHU 2004]
A)
Extent of reaction done
clear
B)
Time of reaction done
clear
C)
Temperature of the system done
clear
D)
Concentration of the system done
clear
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question_answer30)
The rate equation for the reaction \[2A+B\to C\] is found to be: rate \[=k[A][B]\]. The correct statement in relation to this reaction is that the [AIEEE 2004]
A)
Rate of formation of C is twice the rate of disappearance of A done
clear
B)
\[{{t}_{1/2}}\]is a constant done
clear
C)
Unit of k must be \[{{s}^{-1}}\] done
clear
D)
Value of k is independent of the initial concentrations of A and B done
clear
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question_answer31)
The specific rate constant of a first order reaction depends on the [IIT 1981, 83; DPMT 1991; Bihar MEE 1995; KCET 1998]
A)
Concentration of the reactants done
clear
B)
Concentration of the products done
clear
C)
Time of reaction done
clear
D)
Temperature of reaction done
clear
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question_answer32)
If the concentration is expressed in moles per litre, the unit of the rate constant for a first order reaction is [MNR 1986; MP PET 1994, 2000, 01;Bihar MEE 1996; CPMT 1997; MP PMT 1995, 96, 99;AFMC 2002]
A)
mole litre \[^{-1}\,{{\sec }^{-1}}\] done
clear
B)
mole litre\[^{-1}\] done
clear
C)
\[{{\sec }^{-1}}\] done
clear
D)
mole\[^{-1}\] litre\[^{-1}\] sec\[^{-1}\] done
clear
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question_answer33)
The dimension of rate constant of a second order reaction involves [NCERT 1982]
A)
Neither time nor concentration done
clear
B)
Only time done
clear
C)
Time and concentration done
clear
D)
Time and square of concentration done
clear
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question_answer34)
The unit of rate constant of second order reaction is usually expressed as [NCERT 1983, 84; MNR 1983; MP PMT 1994, 99]
A)
mole litre \[{{\sec }^{-1}}\] done
clear
B)
\[mol{{e}^{-1}}\,litr{{e}^{-1}}{{\sec }^{-1}}\] done
clear
C)
\[mole\,litr{{e}^{-1}}\,{{\sec }^{-1}}\] done
clear
D)
\[mol{{e}^{-1}}\,litre\,{{\sec }^{-1}}\] done
clear
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question_answer35)
A zero order reaction is one whose rate is independent of [NCERT 1981]
A)
Temperature of the reaction done
clear
B)
The concentrations of the reactants done
clear
C)
The concentration of the products done
clear
D)
The material of the vessel in which the reaction is carried out done
clear
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question_answer36)
The unit of rate constant for a zero order reaction is [NCERT 1981; MP PMT 2000; RPET 2000]
A)
litre \[{{\sec }^{-1}}\] done
clear
B)
litre \[mol{{e}^{-1}}\,{{\sec }^{-1}}\] done
clear
C)
mole \[litr{{e}^{-1}}{{\sec }^{-1}}\] done
clear
D)
mole \[{{\sec }^{-1}}\] done
clear
View Solution play_arrow
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question_answer37)
Which of the following rate laws has an overall order of 0.5 for reaction involving substances \[x\], \[y\] and \[z\] [AIIMS 1983]
A)
Rate \[=K({{C}_{x}})\,({{C}_{y}})\,({{C}_{z}})\] done
clear
B)
Rate \[=K{{({{C}_{x}})}^{0.5}}\,{{({{C}_{y}})}^{0.5}}\,{{({{C}_{z}})}^{0.5}}\] done
clear
C)
Rate \[=K{{({{C}_{x}})}^{1.5}}\,{{({{C}_{y}})}^{-1}}{{({{C}_{z}})}^{0}}\] done
clear
D)
Rate \[=K({{C}_{x}})\,{{({{C}_{z}})}^{n}}/{{({{C}_{y}})}^{2}}\] done
clear
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question_answer38)
The rates of a certain reaction (dc/dt) at different times are as follows Time Rate (mole litre?1 sec ?1 ) 0 \[2.8\times {{10}^{-2}}\] 10 \[2.78\times {{10}^{-2}}\] 20 \[2.81\times {{10}^{-2}}\] 30 \[2.79\times {{10}^{-2}}\] The reaction is [NCERT 1978]
A)
Zero order done
clear
B)
First order done
clear
C)
Second order done
clear
D)
Third order done
clear
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question_answer39)
For a chemical reaction \[A\to B\] it is found that the rate of reaction doubles, when the concentration of A is increased four times. The order in A for this reaction is [NCERT 1979; AIIMS 1997; J & K CET 2005]
A)
Two done
clear
B)
One done
clear
C)
Half done
clear
D)
Zero done
clear
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question_answer40)
The following data are for the decomposition of ammonium nitrate in aqueous solution Volume of \[{{N}_{2}}\] in cc Time (minutes) 6.25 10 9.50 15 11.42 20 13.65 25 35.05 Finally The order of the reaction is [NCERT 1980]
A)
Zero done
clear
B)
One done
clear
C)
Two done
clear
D)
Three done
clear
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question_answer41)
The hydrolysis of ethyl acetate is a reaction of [MP PMT 1987] \[C{{H}_{3}}COOEt+{{H}_{2}}O\xrightarrow{{{H}^{+}}}C{{H}_{3}}COOH+EtOH\]
A)
First order done
clear
B)
Second order done
clear
C)
Third order done
clear
D)
Zero order done
clear
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question_answer42)
The rate of reaction between \[A\] and \[B\] increases by a factor of 100, when the concentration of \[A\] is increased 10 folds. The order of reaction with respect to \[A\] is [CPMT 1985]
A)
10 done
clear
B)
1 done
clear
C)
4 done
clear
D)
2 done
clear
View Solution play_arrow
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question_answer43)
Which of the following is a first order reaction [MP PMT 1987]
A)
\[N{{H}_{4}}N{{O}_{2}}\to {{N}_{2}}+2{{H}_{2}}O\] done
clear
B)
\[2HI\]\[\to \]\[{{H}_{2}}+{{I}_{2}}\] done
clear
C)
\[2N{{O}_{2}}\to 2NO+{{O}_{2}}\] done
clear
D)
\[2NO+{{O}_{2}}\to 2N{{O}_{2}}\] done
clear
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question_answer44)
The inversion of cane sugar is represented by \[{{C}_{12}}{{H}_{22}}{{O}_{11}}+{{H}_{2}}O\to {{C}_{6}}{{H}_{12}}{{O}_{6}}+{{C}_{6}}{{H}_{12}}{{O}_{6}}\] It is a reaction of [AFMC 1982; MP PMT 1993; RPET 2000]
A)
Second order done
clear
B)
Unimolecular done
clear
C)
Pseudo unimolecular done
clear
D)
None of the three done
clear
View Solution play_arrow
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question_answer45)
Which one of the following formula represents a first order reaction [MP PMT 1999]
A)
\[K=\frac{x}{t}\] done
clear
B)
\[K=\frac{1}{2t}\left[ \frac{1}{{{(a-x)}^{2}}}-\frac{1}{{{a}^{2}}} \right]\] done
clear
C)
\[K=\frac{2.303}{t}{{\log }_{10}}\frac{a}{(a-x)}\] done
clear
D)
\[K=\frac{1}{t}\,\frac{x}{a(a-x)}\] done
clear
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question_answer46)
The first order rate constant for the decomposition of \[{{N}_{2}}{{O}_{5}}\] is \[6.2\times {{10}^{-4}}{{\sec }^{-1}}\]. The half life period for this decomposition in seconds is [MNR 1991; MP PET 1997; UPSEAT 2000]
A)
1117.7 done
clear
B)
111.7 done
clear
C)
223.4 done
clear
D)
160.9 done
clear
View Solution play_arrow
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question_answer47)
A first order reaction which is 30% complete in 30 minutes has a half-life period of [AIIMS 1998]
A)
24.2 min done
clear
B)
58.2 min done
clear
C)
102.2 min done
clear
D)
120.2 min done
clear
View Solution play_arrow
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question_answer48)
The order of a reaction which has the rate expression \[\frac{dc}{dt}=K{{[E]}^{3/2}}{{[D]}^{3/2}}\] is
A)
3/2 done
clear
B)
3 done
clear
C)
2 done
clear
D)
0 done
clear
View Solution play_arrow
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question_answer49)
The reaction \[2{{N}_{2}}{{O}_{5}}\]⇌\[2N{{O}_{2}}+{{O}_{2}}\] follows first order kinetics. Hence, the molecularity of the reaction is
A)
Unimolecular done
clear
B)
Pseudo?unimolecular done
clear
C)
Bimolecular done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer50)
A reaction involving two different reactants [KCET 1989; AIEEE 2005]
A)
Can never be a second order reaction done
clear
B)
Can never be a unimolecular reaction done
clear
C)
Can never be a bimolecular reaction done
clear
D)
Can never be a first order reaction done
clear
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question_answer51)
By ?the overall order of a reaction?, we mean
A)
The number of concentration terms in the equation for the reaction done
clear
B)
The sum of powers to which the concentration terms are raised in the velocity equation done
clear
C)
The least number of molecules of the reactants needed for the reaction done
clear
D)
The number of reactants which take part in the reaction done
clear
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question_answer52)
Catalyst decomposition of hydrogen peroxide is a ........ order reaction
A)
First done
clear
B)
Second done
clear
C)
Third done
clear
D)
Zero done
clear
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question_answer53)
The half life of a first order reaction is
A)
Independent of the initial concentration of the reactant done
clear
B)
Directly proportional to the initial concentration of the reactants done
clear
C)
Inversely proportional to the initial concentration of the reactant done
clear
D)
Directly proportional to the square of the initial concentration of the reactant done
clear
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question_answer54)
The decomposition of \[{{N}_{2}}{{O}_{5}}\] is a first order reaction represented by \[{{N}_{2}}{{O}_{5}}\to {{N}_{2}}{{O}_{4}}+\frac{1}{2}{{O}_{2}}\]. After 15 minutes the volume of \[{{O}_{2}}\] produced is \[9\,ml\] and at the end of the reaction \[35\,ml\]. The rate constant is equal to [MP PET 1995]
A)
\[\frac{1}{15}\,\ln \,\frac{35}{44}\] done
clear
B)
\[\frac{1}{15}\,\ln \,\frac{44}{26}\] done
clear
C)
\[\frac{1}{15}\,\ln \,\frac{44}{35}\] done
clear
D)
\[\frac{1}{15}\,\ln \,\frac{35}{26}\] done
clear
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question_answer55)
The unit of specific reaction rate constant for a first order (if the concentration expressed in molarity) would be [MNR 1988; UPSEAT 2000, 01]
A)
mole \[litr{{e}^{-1}}{{s}^{-1}}\] done
clear
B)
mole \[litr{{e}^{-1}}\] done
clear
C)
mole \[{{s}^{-1}}\] done
clear
D)
\[{{s}^{-1}}\] done
clear
View Solution play_arrow
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question_answer56)
A first order reaction requires 30 minutes for 50% completion. The time required to complete the reaction by 75% will be
A)
45 minutes done
clear
B)
15 minutes done
clear
C)
60 minutes done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer57)
Inversion of canesugar in dilute acid (conversion into glucose and fructose) is a
A)
Unimolecular reaction done
clear
B)
Bimolecular reaction done
clear
C)
Trimolecular reaction done
clear
D)
Pseudo-unimolecular reaction done
clear
View Solution play_arrow
-
question_answer58)
The half life period of a first order reaction [AMU 2000]
A)
\[\frac{0.693}{t}\] done
clear
B)
\[\frac{0.693}{K}\] done
clear
C)
\[\frac{2.303}{t}\] done
clear
D)
\[\frac{0.303}{{{K}_{1}}}\] done
clear
View Solution play_arrow
-
question_answer59)
The order of a reaction is said to be 2 with respect to a reactant X, when [DPMT 2000]
A)
The rate of the reaction is proportional to [X] done
clear
B)
The rate of the reaction is proportional \[{{[X]}^{2}}\] done
clear
C)
Two molecules of X are present in the stoichiometric equation done
clear
D)
The reaction occurs in two steps done
clear
View Solution play_arrow
-
question_answer60)
Decay constant of a reaction is \[1.1\times {{10}^{-9}}/\sec \], then the half life of the reaction is
A)
\[1.2\times {{10}^{8}}\] done
clear
B)
\[6.3\times {{10}^{8}}\] done
clear
C)
\[3.3\times {{10}^{8}}\] done
clear
D)
\[2.1\times {{10}^{8}}\] done
clear
View Solution play_arrow
-
question_answer61)
If the half life period of a reaction is inversely proportional to the initial concentration, the order of the reaction is
A)
Zero done
clear
B)
One done
clear
C)
Two done
clear
D)
Three done
clear
View Solution play_arrow
-
question_answer62)
Which one of the following statements is wrong
A)
Molecularity of a reaction is always a whole number done
clear
B)
Order and molecularity of a reaction need not be same done
clear
C)
Order of a reaction may be zero done
clear
D)
Order of a reaction depends upon the mechanism of the reaction done
clear
View Solution play_arrow
-
question_answer63)
The velocity constant of first order reaction is expressed in the units
A)
Concentration per unit time done
clear
B)
Time per unit concentration done
clear
C)
Per unit time done
clear
D)
Unit time per unit concentration done
clear
View Solution play_arrow
-
question_answer64)
For reation, \[A+B\to \] products, it is found that the rate of the reaction is proportional to the concentration of A, but it is independent of the concentration of B, then
A)
The order of the reaction 2 and molecularity 1 done
clear
B)
Molecularity of the reaction is 2 but order is 1 done
clear
C)
Order is 2 and molecularity is 2 done
clear
D)
Order of the reaction is 2 but molecularity is 0 done
clear
View Solution play_arrow
-
question_answer65)
For a zero order reaction
A)
The concentration of the reactant does not change during the reaction done
clear
B)
The concentration change only when the temperature changes done
clear
C)
The rate remains constant throughout done
clear
D)
The rate of the reaction is proportional to the concentration done
clear
View Solution play_arrow
-
question_answer66)
If ?a? is the initial concentration and ?n? is the order of the reaction and the half life period is ?T?, then [MH CET 2000]
A)
\[T\propto {{a}^{n-1}}\] done
clear
B)
\[T\propto {{a}^{n}}\] done
clear
C)
\[T\propto \frac{1}{{{a}^{n}}}\] done
clear
D)
\[T\propto \frac{1}{{{a}^{n-1}}}\] done
clear
View Solution play_arrow
-
question_answer67)
In presence of \[HCl\], sucrose gets hydrolysed into glucose and fructose. The concentration of sucrose was found to reduce form 0.4 M to 0.2 M in 1 hour and 0.1 M in 2 hours. The order of the reaction is
A)
Zero done
clear
B)
One done
clear
C)
Two done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer68)
The time of half change of a first order reaction in ....... initial concentration
A)
Proportional to done
clear
B)
Inversely proportional to done
clear
C)
Independent of done
clear
D)
Equal to done
clear
View Solution play_arrow
-
question_answer69)
Half life period of a first order reaction is 138.6 minutes. The velocity constant of the reaction is
A)
\[0.05\,{{\min }^{-1}}\] done
clear
B)
\[0.00005\,{{\min }^{-1}}\] done
clear
C)
\[0.005\,{{\min }^{-1}}\] done
clear
D)
\[200\,{{\min }^{-1}}\] done
clear
View Solution play_arrow
-
question_answer70)
An example of a pseudo ?unimolecular reaction is
A)
Dissociation of hydrogen iodide done
clear
B)
Hydrolysis of methyl acetate in dilute solution done
clear
C)
Dissociation of phosphorus pentachloride done
clear
D)
Decomposition of hydrogen peroxide done
clear
View Solution play_arrow
-
question_answer71)
About half life period of a first order reaction, which one of the following statements is generally false
A)
It is independent of initial concentration done
clear
B)
It is independent of temperature done
clear
C)
It decreases with the introduction of a catalyst done
clear
D)
It increases with increase of temperature done
clear
View Solution play_arrow
-
question_answer72)
Decomposition of nitrogen pentoxide is known to be a first order reaction 75 percent of the oxide had decomposed in the first 24 minutes. At the end of an hour, after the start of the reaction, the amount of oxide left will be
A)
Nil done
clear
B)
About 1% done
clear
C)
About 2% done
clear
D)
About 3% done
clear
View Solution play_arrow
-
question_answer73)
A reaction \[2A\to \] products is found to follow zero oder kinetics, then
A)
\[\frac{dx}{dt}=k{{[A]}^{2}}\] done
clear
B)
\[\frac{dx}{dt}=k{{[A]}^{0}}\] done
clear
C)
\[\frac{dx}{dt}=k[A]\] done
clear
D)
\[\frac{dx}{dt}=k[2A]\] done
clear
View Solution play_arrow
-
question_answer74)
The alkaline hydrolysis of ethyl acetate is represented by the equation \[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}+NaOH\to C{{H}_{3}}COONa+{{C}_{2}}{{H}_{5}}OH\] Experimentally it is found that for this reaction \[\frac{dx}{dt}=k[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}]\,[NaOH]\] Then the reaction is [JIPMER 1999]
A)
Bimolecular and of first order done
clear
B)
Bimolecular and of second order done
clear
C)
Pseudo?bimolecular done
clear
D)
Pseudo?unimolecular done
clear
View Solution play_arrow
-
question_answer75)
For the reaction \[2HI\]⇌\[{{H}_{2}}+{{I}_{2}}\], the rate of the reaction is proportional to \[{{[HI]}^{2}}\]. This means that the reaction is [AMU 1985; MP PET 2000]
A)
Unimolecular done
clear
B)
Bimolecular done
clear
C)
Of first order done
clear
D)
Of second order done
clear
View Solution play_arrow
-
question_answer76)
Inversion of sucrose is [AMU 1988; MP PET 2000]
A)
Zero order reaction done
clear
B)
First order reaction done
clear
C)
Second order reaction done
clear
D)
Third order reaction done
clear
View Solution play_arrow
-
question_answer77)
The one which is unimolecular reaction is [MP PMT 1999; UPSEAT 2001]
A)
\[2HI\to {{H}_{2}}+{{I}_{2}}\] done
clear
B)
\[{{N}_{2}}{{O}_{5}}\to {{N}_{2}}{{O}_{4}}+\frac{1}{2}{{O}_{2}}\] done
clear
C)
\[{{H}_{2}}+C{{l}_{2}}\to 2HCl\] done
clear
D)
\[PC{{l}_{3}}+C{{l}_{2}}\to PC{{l}_{5}}\] done
clear
View Solution play_arrow
-
question_answer78)
Integrated velocity equation for first order reaction is
A)
\[{{[A]}_{o}}=[A]\,{{e}^{-Kt}}\] done
clear
B)
\[K={{[A]}_{o}}{{e}^{-A/t}}\] done
clear
C)
\[Kt=2.303\,\log \,\frac{{{[A]}_{o}}}{[A]}\] done
clear
D)
\[\log \,\frac{{{[A]}_{o}}}{[A]}=-2.303\,Kt\] done
clear
View Solution play_arrow
-
question_answer79)
If the surface area of the reactants increases, then order of the reaction
A)
Increases done
clear
B)
Decreases done
clear
C)
Remain constant done
clear
D)
Sometimes increases and sometimes dereases done
clear
View Solution play_arrow
-
question_answer80)
Half life period \[{{t}_{1/2}}\] for first order reaction is
A)
K done
clear
B)
\[\frac{1.303\,\log \,2}{K}\] done
clear
C)
\[\frac{2.303\,\log \,2}{K}\] done
clear
D)
\[\frac{9}{K}\] done
clear
View Solution play_arrow
-
question_answer81)
Molecularity of reaction of inversion of sugar is
A)
3 done
clear
B)
2 done
clear
C)
1 done
clear
D)
0 done
clear
View Solution play_arrow
-
question_answer82)
For any reaction, if we plot a graph between time ?t? and \[\log (a-x)\], a simple line is obtained. The order of reaction is
A)
Zero done
clear
B)
One done
clear
C)
Two done
clear
D)
Three done
clear
View Solution play_arrow
-
question_answer83)
Value of velocity constant for first order reaction is \[3.46\times {{10}^{-3}}{{\min }^{-1}}\], the time for half change is
A)
100 minutes done
clear
B)
400 minutes done
clear
C)
200 minutes done
clear
D)
346 minutes done
clear
View Solution play_arrow
-
question_answer84)
The unit of the velocity constant in case of zero order reaction is [CPMT 1994]
A)
\[Conc.\times tim{{e}^{-1}}\] done
clear
B)
\[Conc{{.}^{-1}}\times time\] done
clear
C)
\[Conc{{.}^{-1}}\times tim{{e}^{-1}}\] done
clear
D)
\[Conc.\times {{(time)}^{2}}\] done
clear
View Solution play_arrow
-
question_answer85)
For the reaction \[{{H}_{2}}(g)+B{{r}_{2}}(g)\to 2HBr(g)\], the experimental data suggest, rate \[=K[{{H}_{2}}]{{[B{{r}_{2}}]}^{1/2}}\]. The molecularity and order of the reaction are respectively [CPMT 1988; MP PET 1993]
A)
\[2,\,\frac{3}{2}\] done
clear
B)
\[\frac{3}{2},\,\frac{3}{2}\] done
clear
C)
1, 1 done
clear
D)
\[1,\,\frac{1}{2}\] done
clear
View Solution play_arrow
-
question_answer86)
The incorrect order indicated against the rate of reaction \[A+B\xrightarrow{K}C\] is [BHU 1990]
A)
Rate Order \[\frac{d[C]}{dt}=K[A]\] 1 done
clear
B)
\[\frac{d[C]}{dt}=K[A]\,[B]\] 2 done
clear
C)
\[\frac{-d\,[A]}{dt}=K\,[A]\,{{[B]}^{0}}\] 2 done
clear
D)
\[\frac{-d\,[A]}{dt}\,K\,[A]\] 1 done
clear
View Solution play_arrow
-
question_answer87)
Which of the following statements regarding the molecularity of a reaction is wrong [CBSE PMT 1989]
A)
It is the number of molecules of the reactants taking part in a single step chemical reaction done
clear
B)
It is calculated from the reaction mechanism done
clear
C)
It may be either a whole number or fractional done
clear
D)
It depends on the rate determining step in the reaction done
clear
View Solution play_arrow
-
question_answer88)
Diazonium salt decomposes as \[{{C}_{6}}{{H}_{5}}N_{2}^{+}C{{l}^{-}}\to {{C}_{6}}{{H}_{5}}Cl+{{N}_{2}}\] At \[{{0}^{o}}C\], the evolution of \[{{N}_{2}}\] becomes two times faster when the initial concentration of the salt is doubled. Therefore, it is [MNR 1994; UPSEAT 2002]
A)
A first order reaction done
clear
B)
A second order reaction done
clear
C)
Independent of the initial concentration of the salt done
clear
D)
A zero order reaction done
clear
View Solution play_arrow
-
question_answer89)
In the reaction \[A+B\to \] Products, if \[B\] is taken in excess, then it is an example of [EAMCET 1992]
A)
Second order reaction done
clear
B)
Zero order reaction done
clear
C)
Pseudounimolecular reaction done
clear
D)
First order reaction done
clear
View Solution play_arrow
-
question_answer90)
The half life of a first order reaction is \[69.35\,\sec \]. The value of the rate constant of the reaction is [CBSE PMT 1990]
A)
\[1.0\,{{s}^{-1}}\] done
clear
B)
\[0.1\,{{s}^{-1}}\] done
clear
C)
\[0.01\,{{s}^{-1}}\] done
clear
D)
\[0.001\,{{s}^{-1}}\] done
clear
View Solution play_arrow
-
question_answer91)
The half life for the reaction \[{{N}_{2}}{{O}_{5}}\]⇌ \[2N{{O}_{2}}+\frac{1}{2}{{O}_{2}}\] in \[24\,hrs\] at \[{{30}^{o}}C\]. Starting with \[10\,g\] of \[{{N}_{2}}{{O}_{5}}\] how many grams of \[{{N}_{2}}{{O}_{5}}\] will remain after a period of 96 hours [KCET 1992]
A)
\[1.25\,g\] done
clear
B)
\[0.63\,g\] done
clear
C)
\[1.77\,g\] done
clear
D)
\[0.5\,g\] done
clear
View Solution play_arrow
-
question_answer92)
The half life of a first order reaction is 10 minutes. If initial amount is \[0.08\,mol/litre\] and concentration at some instant is \[0.01\,mol/litre\], then \[t=\] [Roorkee 1990]
A)
10 minutes done
clear
B)
30 minutes done
clear
C)
20 minutes done
clear
D)
40 minutes done
clear
View Solution play_arrow
-
question_answer93)
Half life period of second order reaction is [MP PMT 1994]
A)
Proportional to the initial concentration of reactants done
clear
B)
Independent of the initial concentration of reactants done
clear
C)
Inversely proportional to initial concentration of reactants done
clear
D)
Inversely proportional to square of initial concentration of reactants done
clear
View Solution play_arrow
-
question_answer94)
The reaction \[2{{H}_{2}}{{O}_{2}}\to 2{{H}_{2}}O+{{O}_{2}}\] is a [Manipal MEE 1995]
A)
Zero order reaction done
clear
B)
First order reaction done
clear
C)
Second order reaction done
clear
D)
Third order reaction done
clear
View Solution play_arrow
-
question_answer95)
In a reaction involving hydrolysis of an organic chloride in presence of large excess of water \[RCl+{{H}_{2}}O\to ROH+HCl\] [MP PET 1995]
A)
Molecularity is 2, order of reaction is also 2 done
clear
B)
Molecularity is 2, order of reaction is 1 done
clear
C)
Molecularity is 1, order of reaction is 2 done
clear
D)
Molecularity is 1, order of reaction is also 1 done
clear
View Solution play_arrow
-
question_answer96)
The thermal decomposition of a compound is of first order. If a sample of the compound decomposes 50% in 120 minutes, in what time will it undergo 90% decomposition [MP PET 1996]
A)
Nearly 240 minutes done
clear
B)
Nearly 480 minutes done
clear
C)
Nearly 450 minutes done
clear
D)
Nearly 400 minutes done
clear
View Solution play_arrow
-
question_answer97)
The order of a reaction with rate equals \[kC_{A}^{3/2}\,C_{B}^{-1/2}\] is [MP PET 1996, 2001]
A)
2 done
clear
B)
1 done
clear
C)
\[-\frac{1}{2}\] done
clear
D)
\[\frac{3}{2}\] done
clear
View Solution play_arrow
-
question_answer98)
If the rate expression for a chemical reaction is given by Rate \[=k{{[A]}^{m}}{{[B]}^{n}}\] [MP PMT 1996]
A)
The order of the reaction is \[m\] done
clear
B)
The order of the reaction is \[n\] done
clear
C)
The order of the reaction is \[m+n\] done
clear
D)
The order of the reaction is \[m-n\] done
clear
View Solution play_arrow
-
question_answer99)
The half-life period of a first order reaction is 100 sec. The rate constant of the reaction is [MP PMT 1997; MP PET 2001]
A)
\[6.93\times {{10}^{-3}}{{\sec }^{-1}}\] done
clear
B)
\[6.93\times {{10}^{-4}}{{\sec }^{-1}}\] done
clear
C)
\[0.693\,{{\sec }^{-1}}\] done
clear
D)
\[69.3\,{{\sec }^{-1}}\] done
clear
View Solution play_arrow
-
question_answer100)
For the first order reaction with rate constant \[k\], which expression gives the half-life period ? (Initial concentration \[=a\]) [MP PET/PMT 1998]
A)
\[\frac{{{1}^{2}}}{k}\] done
clear
B)
\[\frac{1}{ka}\] done
clear
C)
\[\frac{0.693}{k}\] done
clear
D)
\[\frac{3}{2k{{a}^{2}}}\] done
clear
View Solution play_arrow
-
question_answer101)
The rate constant of a first order reaction whose half-life is 480 seconds, is [MP PET 1999]
A)
\[2.88\times {{10}^{-3}}{{\sec }^{-1}}\] done
clear
B)
\[1.44\times {{10}^{-3}}{{\sec }^{-1}}\] done
clear
C)
\[1.44\,{{\sec }^{-1}}\] done
clear
D)
\[0.72\times {{10}^{-3}}{{\sec }^{-1}}\] done
clear
View Solution play_arrow
-
question_answer102)
The conversion of \[A\to B\] follows second order kinetics. Doubling the concentration of \[A\] will increase the rate of formation of \[B\] by a factor [MP PET 1999; DCE 1999; KCET 2001; BCECE 2005]
A)
\[1/4\] done
clear
B)
2 done
clear
C)
\[1/2\] done
clear
D)
4 done
clear
View Solution play_arrow
-
question_answer103)
The reaction \[2FeC{{l}_{3}}+SnC{{l}_{2}}\to 2FeC{{l}_{2}}+SnC{{l}_{4}}\] is an example of [CBSE PMT 1996; MP PET 1999]
A)
First order reaction done
clear
B)
Second order reaction done
clear
C)
Third order reaction done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer104)
If reaction between \[A\] and \[B\] to give \[C\]shows first order kinetics in \[A\] and second order in \[B\], the rate equation can be written as [MP PET 1999]
A)
Rate \[=k\,[A]\,{{[B]}^{1/2}}\] done
clear
B)
Rate \[=k{{[A]}^{1/2}}[B]\] done
clear
C)
Rate \[=k\,[A]\,{{[B]}^{2}}\] done
clear
D)
Rate \[=k{{[A]}^{2}}[B]\] done
clear
View Solution play_arrow
-
question_answer105)
For a first order reaction, the half-life period is independent of [CBSE PMT 1999]
A)
Initial concentration done
clear
B)
Cube root of initial concentration done
clear
C)
First power of final concentration done
clear
D)
Square root of final concentration done
clear
View Solution play_arrow
-
question_answer106)
Order of a reaction can have [DPMT 1996]
A)
\[+ve\] values done
clear
B)
Whole number values done
clear
C)
Fractional values done
clear
D)
All of the above done
clear
View Solution play_arrow
-
question_answer107)
The order of the reaction occurring by following mechanism should be [JIPMER 1997] (i) \[{{A}_{2}}\to A+A\] (fast) (ii) \[A+{{B}_{2}}\to AB+B\] (slow) (iii) \[A+B\to \] (fast)
A)
\[1\,\frac{1}{2}\] done
clear
B)
\[3\frac{1}{2}\] done
clear
C)
2 done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer108)
For the reaction \[A\to B\], the rate law expression is : Rate \[=\,k\,[A]\] Which of the following statements is incorrect [Pb. PMT 1998]
A)
The reaction is said to follow first order kinetics done
clear
B)
The half life of the reaction will depend on the initial concentration of the reactant done
clear
C)
\[k\]is constant for the reaction at a constant temperature done
clear
D)
The rate law provides a simple way of predicting the concentration of reactants and products at any time after the start of the reaction done
clear
View Solution play_arrow
-
question_answer109)
If initial concentration is reduced to its 1/4th in a zero order reaction, the time taken for half of the reaction to complete [BHU 1998]
A)
Remains same done
clear
B)
Becomes 4 times done
clear
C)
Becomes one-fourth done
clear
D)
Doubles done
clear
View Solution play_arrow
-
question_answer110)
For a reaction whose rate expression is : Rate \[=k{{[A]}^{1/2}}{{[B]}^{3/2}}\], the order would be [Pune CET 1998]
A)
1.5 done
clear
B)
2 done
clear
C)
3 done
clear
D)
1 done
clear
View Solution play_arrow
-
question_answer111)
For the reaction\[A\to B\], the rate increases by a factor of 2.25 when the concentration of \[A\] is increased by 1.5. What is the order of the reaction [KCET 1998]
A)
3 done
clear
B)
0 done
clear
C)
2 done
clear
D)
1 done
clear
View Solution play_arrow
-
question_answer112)
For the reaction \[{{H}_{2}}+C{{l}_{2}}\xrightarrow{\text{Sunlight}}2HCl\] taking place on water, the order of reaction is [KCET 1998; AIIMS 2002; Pb. PMT 2002]
A)
1 done
clear
B)
2 done
clear
C)
3 done
clear
D)
0 done
clear
View Solution play_arrow
-
question_answer113)
For a first order reaction, rate constant is \[0.6932\,h{{r}^{-1}}\], then half-life for the reaction is [Bihar MEE 1997]
A)
\[0.01\,hr\] done
clear
B)
\[1\,hr\] done
clear
C)
\[2\,hr\] done
clear
D)
\[10\,hr\] done
clear
E)
\[0.1\,hr\] done
clear
View Solution play_arrow
-
question_answer114)
The rate constant of a reaction is \[0.69\times {{10}^{-1}}{{\min }^{-1}}\] and the initial concentration is \[0.2mol\,{{l}^{-1}}.\] The half-life period is [AIIMS 1998]
A)
400 sec done
clear
B)
600 sec done
clear
C)
800 sec done
clear
D)
1200 sec done
clear
View Solution play_arrow
-
question_answer115)
The rate constant of a first order reaction is \[3\times {{10}^{-6}}\]per second. If the initial concentration is 0.10 m, the initial rate of reaction is [AFMC 1999 Pb. PMT 1999, 2000; BHU 1999; AIIMS 1999; KCET 2000; DCE 2004]
A)
\[3\times {{10}^{-5}}m{{s}^{-1}}\] done
clear
B)
\[3\times {{10}^{-6}}m{{s}^{-1}}\] done
clear
C)
\[3\times {{10}^{-8}}m{{s}^{-1}}\] done
clear
D)
\[3\times {{10}^{-7}}m{{s}^{-1}}\] done
clear
View Solution play_arrow
-
question_answer116)
Certain bimolecular reactions which follow the first order kinetics are called [KCET (Med.) 1999]
A)
First order reactions done
clear
B)
Unimolecular reactions done
clear
C)
Bimolecular reactions done
clear
D)
Pseudounimolecular reactions done
clear
View Solution play_arrow
-
question_answer117)
The rate law of the reaction \[A+2B\to \]Product is given by \[\frac{d[dB]}{dt}=k[{{B}^{2}}]\]. If A is taken in excess, the order of the reaction will be [AMU (Engg.) 1999]
A)
1 done
clear
B)
2 done
clear
C)
3 done
clear
D)
0 done
clear
View Solution play_arrow
-
question_answer118)
For a first order reaction \[A\to \]product, the rate of reaction at \[[A]=0.2\,\,mol\,\,{{l}^{-1}}\] is \[1.0\times {{10}^{-2}}mol\,\,{{l}^{-1}}\,{{\min }^{-1}}\]. The half life period for the reaction is [Roorkee 1999]
A)
832 s done
clear
B)
440 s done
clear
C)
416 s done
clear
D)
13.86 s done
clear
View Solution play_arrow
-
question_answer119)
For the reaction \[A+B\to \]products, doubling the concentration of A the rate of the reaction is doubled, but on doubling the concentration of B rate remains unaltered. The over all order of the reaction is [JIPMER 1999]
A)
1 done
clear
B)
0 done
clear
C)
2 done
clear
D)
3 done
clear
View Solution play_arrow
-
question_answer120)
Which among the following is a false statement [KCET 1999]
A)
Half life of a third order reaction is inversely proportional to the square of initial concentration of the reactant. done
clear
B)
Molecularity of a reaction may be zero or fractional done
clear
C)
For a first order reaction \[{{t}_{1/2}}=\frac{0.693}{K}\] done
clear
D)
Rate of zero order reaction is independent of initial concentration of reactant done
clear
View Solution play_arrow
-
question_answer121)
After how many seconds will the concentration of the reactants in a first order reaction be halved, if the decay constant is \[\text{1}\text{.155}\times \text{1}{{\text{0}}^{\text{-3}}}{{\sec }^{-1}}\] [CBSE PMT 2000]
A)
100 sec done
clear
B)
200 sec done
clear
C)
400 sec done
clear
D)
600 sec done
clear
View Solution play_arrow
-
question_answer122)
What is the order of a reaction which has a rate expression rate \[=K{{[A]}^{3/2}}{{[B]}^{-1}}\] [DCE 2000]
A)
3/2 done
clear
B)
½ done
clear
C)
0 done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer123)
Which of the following expression is correct for first order reaction? \[(CO)\] refers to initial concentration of reactant [DCE 2000]
A)
\[{{t}_{1/2}}\propto CO\] done
clear
B)
\[{{t}_{1/2}}\propto C{{O}^{-1}}\] done
clear
C)
\[{{t}_{1/2}}\propto C{{O}^{-2}}\] done
clear
D)
\[{{t}_{1/2}}\propto C{{O}^{0}}\] done
clear
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question_answer124)
For a reaction \[2NO(g)+C{{l}_{2}}(g)\]⇌\[\,2NOCl(g)\]. When concentration of \[C{{l}_{2}}\] is doubled, the rate of reaction becomes two times of the original. When the concentration of NO is doubled the rate becomes four times. What is the order of the reaction [MP PMT 2000]
A)
1 done
clear
B)
2 done
clear
C)
3 done
clear
D)
4 done
clear
View Solution play_arrow
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question_answer125)
The rate constant for a second order reaction is \[8\times {{10}^{-5}}{{M}^{-1}}mi{{n}^{-1}}\]. How long will it take a 1M solution to be reduced to 0.5 M [MH CET 2001]
A)
\[8\times {{10}^{-5}}\]min done
clear
B)
\[8.665\times {{10}^{3}}\]min done
clear
C)
\[4\times {{10}^{-5}}\]min done
clear
D)
\[1.25\times {{10}^{4}}\]min done
clear
View Solution play_arrow
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question_answer126)
The rate for a first order reaction is \[0.6932\times {{10}^{-2}}mol\,{{l}^{-1}}mi{{n}^{-1}}\] and the initial concentration of the reactants is 1M, \[{{T}_{1/2}}\] is equal to [JIPMER (Med.) 2001]
A)
\[6.932\] min done
clear
B)
100 min done
clear
C)
\[0.6932\times {{10}^{-3}}\] min done
clear
D)
\[0.6932\times {{10}^{-2}}\] min done
clear
View Solution play_arrow
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question_answer127)
For a given reaction \[{{t}_{1/2}}=\frac{1}{Ka}.\]. The order of the reaction is [KCET 2001]
A)
1 done
clear
B)
0 done
clear
C)
3 done
clear
D)
2 done
clear
View Solution play_arrow
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question_answer128)
75% of a first order reaction is completed in 30 minutes. What is the time required for 93.75% of the reaction (in minutes) [KCET 2001]
A)
45 done
clear
B)
120 done
clear
C)
90 done
clear
D)
60 done
clear
View Solution play_arrow
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question_answer129)
A First order reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed [AIIMS 2001]
A)
5 hours done
clear
B)
7.5 hours done
clear
C)
10 hours done
clear
D)
20 hours done
clear
View Solution play_arrow
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question_answer130)
A substance ?A? decomposes by a first order reaction starting initially with [A] =2.00m and after 200 min [A] = 0.15m. For this reaction what is the value of k [AIIMS 2001]
A)
\[1.29\times {{10}^{-2}}{{\min }^{-1}}\] done
clear
B)
\[2.29\times {{10}^{-2}}{{\min }^{-1}}\] done
clear
C)
\[3.29\times {{10}^{-2}}{{\min }^{-1}}\] done
clear
D)
\[4.40\times {{10}^{-2}}{{\min }^{-1}}\] done
clear
View Solution play_arrow
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question_answer131)
Which of the following statements about zero order reaction is not true [DCE 2001]
A)
Its unit is \[se{{c}^{-1}}\] done
clear
B)
The graph between log (reactant) versus rate of reaction is a straight line done
clear
C)
The rate of reaction increases with the decrease in concentration of reactants done
clear
D)
Rate of reaction is independent of concentration of reactants done
clear
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question_answer132)
The given reaction \[2NO+{{O}_{2}}\to 2N{{O}_{2}}\] is an example of [CBSE PMT 2001; JIPMER 2002]
A)
First order reaction done
clear
B)
Second order reaction done
clear
C)
Third order reaction done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer133)
Order of a reaction is decided by [KCET 2002]
A)
Pressure done
clear
B)
Temperature done
clear
C)
Molecularity done
clear
D)
Relative concentration of reactants done
clear
View Solution play_arrow
-
question_answer134)
From the following which is a second order reaction [AMU 2002]
A)
\[K=5.47\times {{10}^{-4}}{{\sec }^{-1}}\] done
clear
B)
\[K=3.9\times {{10}^{-3}}\text{mole}\,\,\text{lit}\,\,{{\sec }^{-1}}\] done
clear
C)
\[K=3.94\times {{10}^{-4}}\text{lit}\,\,\text{mol}{{\text{e}}^{\text{-1}}}\,\,{{\sec }^{-1}}\] done
clear
D)
\[K=3.98\times {{10}^{-5}}\text{lit}\,\,\text{mol}{{\text{e}}^{\text{-2}}}\,\,{{\sec }^{-1}}\] done
clear
View Solution play_arrow
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question_answer135)
For the reaction \[A+2B\to C,\] rate is given by R \[=[A]{{[B]}^{2}}\] then the order of the reaction is [AIEEE 2002]
A)
3 done
clear
B)
6 done
clear
C)
5 done
clear
D)
7 done
clear
View Solution play_arrow
-
question_answer136)
Units of rate constant of first and zero order reactions in terms of molarity M unit are respectively [AIEEE 2002]
A)
\[se{{c}^{-1}},\,\,\,M\,se{{c}^{-1}}\] done
clear
B)
\[se{{c}^{-1}},\,\,\,M\] done
clear
C)
\[M\,se{{c}^{-1}},\,\,\,se{{c}^{-1}}\] done
clear
D)
\[M,\,se{{c}^{-1}}\] done
clear
View Solution play_arrow
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question_answer137)
The reaction \[2{{N}_{2}}{{O}_{5}}\] ⇌ \[2{{N}_{2}}{{O}_{4}}+{{O}_{2}}\] is [MP PMT 2002]
A)
Bimolecular and second order done
clear
B)
Unimolecular and first order done
clear
C)
Bimolecular and first order done
clear
D)
Bimolecular and zero order done
clear
View Solution play_arrow
-
question_answer138)
The half-life period for a first order reaction is 693 seconds. The rate constants for this reaction would be [MP PET 2002]
A)
\[0.1se{{c}^{-1}}\] done
clear
B)
\[0.01se{{c}^{-1}}\] done
clear
C)
\[0.001se{{c}^{-1}}\] done
clear
D)
\[0.0001se{{c}^{-1}}\] done
clear
View Solution play_arrow
-
question_answer139)
For an elementary reaction, 2A + B\[\to \]C + D the molecularity is [Kurukshetra CEE 2002]
A)
Zero done
clear
B)
One done
clear
C)
Two done
clear
D)
Three done
clear
View Solution play_arrow
-
question_answer140)
If the order of the reaction \[x+y\xrightarrow{hv}x\,y\] is zero, it means that the rate of [Kurukshetra CEE 2002]
A)
Reaction is independent of temperature done
clear
B)
Formation of activated complex is zero done
clear
C)
Reaction is independent of the concentration of reacting species done
clear
D)
Decomposition of activated complex is zero done
clear
View Solution play_arrow
-
question_answer141)
For a first order reaction velocity constant, \[K={{10}^{-3}}{{s}^{-1}}\]. Two third life for it would be [MP PET 2001; UPSEAT 2003]
A)
1100 s done
clear
B)
2200 s done
clear
C)
3300 s done
clear
D)
4400 s done
clear
View Solution play_arrow
-
question_answer142)
In a reaction, the concentration of reactant is increased two times and three times then the increases in rate of reaction were four times and nine times respectively, order of reaction is [UPSEAT 2003]
A)
Zero done
clear
B)
1 done
clear
C)
2 done
clear
D)
3 done
clear
View Solution play_arrow
-
question_answer143)
For a chemical reaction....can never be a fraction [EAMCET 2003]
A)
Order done
clear
B)
Half-life done
clear
C)
Molecularity done
clear
D)
Rate constant done
clear
View Solution play_arrow
-
question_answer144)
75% of a first order reaction was completed in 32 minutes when was 50% of the reaction completed [AMU 1999; Kerala (Med.) 2003]
A)
16 min. done
clear
B)
24 min. done
clear
C)
8 min. done
clear
D)
4 min. done
clear
View Solution play_arrow
-
question_answer145)
The decomposition of \[{{N}_{2}}{{O}_{5}}\] occurs as, \[2{{N}_{2}}{{O}_{5}}\to 4N{{O}_{2}}+{{O}_{2}}\], and follows Ist order kinetics, hence [BVP 2003]
A)
The reaction is unimolecular done
clear
B)
The reaction is bimolecular done
clear
C)
\[{{T}_{1/2}}\propto {{a}^{0}}\] done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer146)
Which equation is correct for first order reactions [MP PMT 2003]
A)
\[{{t}_{1/2}}\propto {{C}^{-1}}\] done
clear
B)
\[{{t}_{1/2}}\propto C\] done
clear
C)
\[{{t}_{1/2}}\propto {{C}^{0}}\] done
clear
D)
\[{{t}_{1/2}}\propto {{C}^{1/2}}\] done
clear
View Solution play_arrow
-
question_answer147)
For the reaction system \[2NO(g)+{{O}_{2}}(g)\to 2N{{O}_{2}}(g)\] volume is suddenly produced to half its value by increasing the pressure on it. If the reaction is of first order with respect to \[{{O}_{2}}\] and second order with respect to \[NO\], the rate of reaction will [AIEEE 2003]
A)
Diminish to one fourth of its initial value done
clear
B)
Diminish to one eighth of its initial value done
clear
C)
Increase to eight times of its initial value done
clear
D)
Increase to four times of its initial value done
clear
View Solution play_arrow
-
question_answer148)
If the rate of the reaction is equal to the rate constant, the order of the reaction is [CBSE PMT 2003]
A)
3 done
clear
B)
0 done
clear
C)
1 done
clear
D)
2 done
clear
View Solution play_arrow
-
question_answer149)
The reaction \[A\to B\]follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B [CBSE PMT 2003]
A)
2 hours done
clear
B)
1 hour done
clear
C)
0.5 hour done
clear
D)
0.25 hour done
clear
View Solution play_arrow
-
question_answer150)
The unit of velocity constant in case of zero order reaction is [MP PMT 2004]
A)
Concentration\[\times \text{Tim}{{\text{e}}^{-1}}\] done
clear
B)
\[\text{Concentratio}{{\text{n}}^{\text{-1}}}\times \text{Tim}{{\text{e}}^{\text{-1}}}\] done
clear
C)
\[\text{Concentration}\times \text{Tim}{{\text{e}}^{\text{2}}}\] done
clear
D)
\[\text{Concentratio}{{\text{n}}^{\text{-1}}}\times \text{Time}\] done
clear
View Solution play_arrow
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question_answer151)
Which one of the following is wrongly matched [KCET 2004]
A)
Saponification of\[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}\]? Second order reaction done
clear
B)
Hydrolysis of \[C{{H}_{3}}COOC{{H}_{3}}\]? Pseudo uni-molecular reaction done
clear
C)
Decomposition of \[{{H}_{2}}{{O}_{2}}\] ? First order reaction done
clear
D)
Combination of \[{{H}_{2}}\]and \[B{{r}_{2}}\] to give \[HBr\] ? Zero order reaction done
clear
View Solution play_arrow
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question_answer152)
Which of the following is an example of pseudo unimolecular reaction [Pb. CET 2001]
A)
\[C{{H}_{3}}COOC{{H}_{3}}+{{H}_{2}}O\xrightarrow{{{H}^{+}}}C{{H}_{3}}COOH+C{{H}_{3}}OH\] done
clear
B)
\[C{{H}_{3}}COOC{{H}_{3}}+{{H}_{2}}O\xrightarrow{O{{H}^{-}}}C{{H}_{3}}COOH+C{{H}_{3}}OH\] done
clear
C)
\[2FeC{{l}_{3}}+SnC{{l}_{2}}\to SnC{{l}_{4}}+2FeC{{l}_{2}}\] done
clear
D)
\[NaOH+HCl\to NaCl+{{H}_{2}}O\] done
clear
View Solution play_arrow
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question_answer153)
Hydrolysis of DDT is a first order reaction, its half life is 10 years. Time to hydrolyse 10 g DDT to half is [BVP 2004]
A)
100 years done
clear
B)
50 years done
clear
C)
5 years done
clear
D)
10 years done
clear
View Solution play_arrow
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question_answer154)
In a first order reaction, the concentration of the reactant, decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is [AIEEE 2004]
A)
7.5 minutes done
clear
B)
15 minutes done
clear
C)
30 minutes done
clear
D)
60 minutes done
clear
View Solution play_arrow
-
question_answer155)
In the first order reaction, the concentration of the reactant is reduced to 25% in one hour. The half life period of the reaction is [DCE 2004]
A)
2 hr done
clear
B)
4 hr done
clear
C)
1/2 hr done
clear
D)
1/4 hr done
clear
View Solution play_arrow
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question_answer156)
For a reaction, \[X(g)\to Y(g)+Z(g)\]the half life period is 10 min. In What period of time would the concentration of X be reduced to 10% of original concentration [DCE 2004]
A)
20 min done
clear
B)
33 min done
clear
C)
15 min done
clear
D)
25 min done
clear
View Solution play_arrow
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question_answer157)
A first order reaction with respect to the reactant A has a rate constant of \[6\ {{\sec }^{-1}}\]. If we start with [A] = 0.5 mol/litre, then in what time the concentration of A becomes 0.05 mol/litre [DCE 2004]
A)
0.384 sec done
clear
B)
0.214 sec done
clear
C)
3.84 sec done
clear
D)
0.402 sec done
clear
View Solution play_arrow
-
question_answer158)
Order of radioactive disintegration reaction is [JEE Orissa 2004]
A)
Zero done
clear
B)
First done
clear
C)
Second done
clear
D)
Third done
clear
View Solution play_arrow
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question_answer159)
The rate of a first order reaction is \[1.5\times {{10}^{-2}}\ mol{{L}^{-1}}\ {{\min }^{-1}}\]at 0.5 M concentration of the reactant. The half life of the reaction is [CBSE PMT 2004]
A)
8.73 min done
clear
B)
7.53 min done
clear
C)
0.383 min done
clear
D)
23.1 min done
clear
View Solution play_arrow
-
question_answer160)
A first order reaction was started with a decimolar solution of the reactant, 8 minutes and 20 seconds later its concentration was found to be \[M/100\]. So the rate of the reaction is [Kerala PMT 2004]
A)
\[2.303\times {{10}^{-5}}\ {{\sec }^{-1}}\] done
clear
B)
\[2.303\times {{10}^{-4}}\ {{\sec }^{-1}}\] done
clear
C)
\[4.606\times {{10}^{-3}}\ {{\sec }^{-1}}\] done
clear
D)
\[2.606\times {{10}^{-5}}\ {{\sec }^{-1}}\] done
clear
E)
\[2.603\times {{10}^{-4}}\ {{\sec }^{-1}}\] done
clear
View Solution play_arrow
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question_answer161)
Which is correct about zero order reaction [JEE Orissa 2004]
A)
Rate of reaction depends on decay constant done
clear
B)
Rate of reaction is independent of concentration done
clear
C)
Unit of rate constant is concentration?1 done
clear
D)
Unit of rate constant is concentration?1 time?1 done
clear
View Solution play_arrow
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question_answer162)
Decay of \[_{92}{{U}^{235}}\]is .....order reaction [JEE Orissa 2004]
A)
Zero done
clear
B)
First done
clear
C)
Second done
clear
D)
Third done
clear
View Solution play_arrow
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question_answer163)
The half-life of 2 sample are 0.1 and 0.4 seconds. Their respective concentration are 200 and 50 respectively. What is the order of the reaction [JEE Orissa 2004]
A)
0 done
clear
B)
2 done
clear
C)
1 done
clear
D)
4 done
clear
View Solution play_arrow
-
question_answer164)
The following statements(s) is(are) correct [IIT 1999]
A)
A plot of \[\log \,{{K}_{p}}\] versus \[1/T\] is linear done
clear
B)
A plot of \[\log \,[X]\] versus time is linear for a first order reaction \[X\to P\] done
clear
C)
A plot of \[\log P\] versus \[1/T\] is linear at constant volume done
clear
D)
A plot of \[P\] versus \[1/V\] is linear at constant temperature done
clear
View Solution play_arrow
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question_answer165)
For a first order reaction [IIT 1998]
A)
The degree of dissociation is equal to \[(1-{{e}^{-kt}})\] done
clear
B)
A plot of reciprocal concentration of the reactant vs time gives a straight line done
clear
C)
The time taken for the completion of 75% reaction is thrice the \[{{t}_{1/2}}\] of the reaction done
clear
D)
The pre-exponential factor in the Arrhenius equation has the dimension of time \[{{T}^{-1}}\] done
clear
View Solution play_arrow
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question_answer166)
For reaction a \[A\to x\ P\], when \[[A]=2.2\ mM\], the rate was found to be \[2.4\ mM\ {{s}^{-1}}\]. On reducing concentration of A to half, the rate changes to \[0.6\ mM\ {{s}^{-1}}\]. The order of reaction with respect to A is [AIIMS 2005]
A)
1.5 done
clear
B)
2.0 done
clear
C)
2.5 done
clear
D)
3.0 done
clear
View Solution play_arrow
-
question_answer167)
Which one of the following statement for order of reaction is not correct [IIT 2005]
A)
Order can be determined experimentally. done
clear
B)
Order of reaction is equal to sum of the powers of concentration terms in differential rate law. done
clear
C)
It is not affected with the stoichiometric coefficient of the reactants. done
clear
D)
Order cannot be fractional. done
clear
View Solution play_arrow
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question_answer168)
\[{{t}_{\frac{1}{4}}}\] can be taken as the time taken for the concentration of a reactant to drop to \[\frac{3}{4}\] of its initial value. If the rate constant for a first order reaction is \[K\], the \[{{t}_{\frac{1}{4}}}\] can be written as [AIEEE 2005]
A)
\[0.10/K\] done
clear
B)
\[0.29/K\] done
clear
C)
\[0.69/K\] done
clear
D)
\[0.75/K\] done
clear
View Solution play_arrow
-
question_answer169)
For a first order reaction \[A\to B\] the reaction rate at reactant concentration of \[0.01M\] is found to be \[2.0\times {{10}^{-5}}mol\ {{L}^{-1}}{{s}^{1}}\]. The half life period of the reaction is [CBSE PMT 2005]
A)
220 s done
clear
B)
30 s done
clear
C)
300 s done
clear
D)
347 s done
clear
View Solution play_arrow
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question_answer170)
The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is [CBSE PMT 2005]
A)
- 1 done
clear
B)
- 2 done
clear
C)
1 done
clear
D)
2 done
clear
View Solution play_arrow
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question_answer171)
If a substance with half life 3 days is taken at other place in 12 days. What amount of substance is left now [AFMC 2005]
A)
1/4 done
clear
B)
1/8 done
clear
C)
1/16 done
clear
D)
1/32 done
clear
View Solution play_arrow
-
question_answer172)
The half-life of a first order reaction having rate constant K = 1.7 ´ 10-5 s-1 is [BHU 2005]
A)
12.1 h done
clear
B)
9.7 h done
clear
C)
11.3 h done
clear
D)
1.8 h done
clear
View Solution play_arrow
-
question_answer173)
For the reaction \[A+B\to C\], it is found that doubling the concentration of A increases the rate by 4 times, and doubling the concentration of B doubles the reaction rate. What is the overal order of the reaction. [KCET 2005]
A)
4 done
clear
B)
3/2 done
clear
C)
3 done
clear
D)
1 done
clear
View Solution play_arrow
-
question_answer174)
Which of the following reactions end in finite time [DPMT 2005]
A)
0 order done
clear
B)
1st order done
clear
C)
2nd order done
clear
D)
3rd order done
clear
View Solution play_arrow