-
question_answer1)
The rate of a chemical reaction [MP PMT 1973; CPMT 1982]
A)
Increases as the reaction proceeds done
clear
B)
Decreases as the reaction proceeds done
clear
C)
May increase or decrease during the reaction done
clear
D)
Remains constant as the reaction proceeds done
clear
View Solution play_arrow
-
question_answer2)
The rate of a reaction that not involve gases is not dependent on [CPMT 1988; AFMC 1995]
A)
Pressure done
clear
B)
Temperature done
clear
C)
Concentration done
clear
D)
Catalyst done
clear
View Solution play_arrow
-
question_answer3)
The rate at which a substance reacts depends on its [MP PMT 1987; BHU 1999; KCET 2005]
A)
Atomic weight done
clear
B)
Equivalent weight done
clear
C)
Molecular weight done
clear
D)
Active mass done
clear
View Solution play_arrow
-
question_answer4)
The rate law for the reaction \[RCl+NaOH(aq)\to ROH+NaCl\] is given by Rate \[={{K}_{1}}[RCl]\]. The rate of the reaction will be [IIT 1988]
A)
Doubled on doubling the concentration of sodium hydroxide done
clear
B)
Halved on reducing the concentration of alkyl halide to one half done
clear
C)
Decreased on increasing the temperature of the reaction done
clear
D)
Unaffected by increasing the temperature of the reaction done
clear
View Solution play_arrow
-
question_answer5)
If doubling the concentration of a reactant `A' increases the rate 4 times and tripling the concentration of `A' increases the rate 9 times, the rate is proportional to [AIIMS 1991]
A)
Concentration of `A' done
clear
B)
Square of concentration of `A' done
clear
C)
Under root of the concentration of `A' done
clear
D)
Cube of concentration of `A' done
clear
View Solution play_arrow
-
question_answer6)
The rate of chemical reaction at constant temperature is proportional to
A)
The amount of products formed done
clear
B)
The product of masses of the reactants done
clear
C)
The product of the molar concentration of the reactants done
clear
D)
The mean free path of the reaction done
clear
View Solution play_arrow
-
question_answer7)
The concentration of a reactant decreases from 0.2 M to 0.1 M in 10 minutes. The rate of the reaction is
A)
0.01 M done
clear
B)
\[{{10}^{-2}}\] done
clear
C)
0.01 mol \[d{{m}^{-3}}\,{{\min }^{-1}}\] done
clear
D)
1 mol \[d{{m}^{-3}}\,{{\min }^{-1}}\] done
clear
View Solution play_arrow
-
question_answer8)
When a reaction is progressing
A)
The rate of the reaction goes on increasing done
clear
B)
The concentration of the products goes on decreasing done
clear
C)
The concentration of the reactants goes on decreasing done
clear
D)
The reaction rate always remains constant done
clear
View Solution play_arrow
-
question_answer9)
In a catalytic conversion of \[{{N}_{2}}\] to \[N{{H}_{3}}\] by Haber's process, the rate of reaction was expressed as change in the concentration of ammonia per time is \[40\times {{10}^{-3}}\,mol\,litr{{e}^{-1}}{{s}^{-1}}\]. If there are no side reaction, the rate of the reaction as expressed in terms of hydrogen is (in mol \[litr{{e}^{-1}}{{s}^{-1}}\])
A)
\[60\times {{10}^{-3}}\] done
clear
B)
\[20\times {{10}^{-3}}\] done
clear
C)
1.200 done
clear
D)
\[10.3\times {{10}^{-3}}\] done
clear
View Solution play_arrow
-
question_answer10)
If the concentration of the reactants is increased, the rate of reaction [MP PMT 1989]
A)
Remains unaffected done
clear
B)
Increases done
clear
C)
Decreases done
clear
D)
May increase or decrease done
clear
View Solution play_arrow
-
question_answer11)
Time required for completion of ionic reactions in comparison to molecular reactions is
A)
Maximum done
clear
B)
Minimum done
clear
C)
Equal done
clear
D)
None done
clear
View Solution play_arrow
-
question_answer12)
For reaction \[2A+B\to \] products, the active mass of B is kept constant and that of A is doubled. The rate of reaction will then [MP PET 1993]
A)
Increase 2 times done
clear
B)
Increase 4 times done
clear
C)
Decrease 2 times done
clear
D)
Decrease 4 times done
clear
View Solution play_arrow
-
question_answer13)
In a reaction \[2A+B\to {{A}_{2}}B\], the reactant A will disappear at [MP PET 1993]
A)
Half the rate that B will decrease done
clear
B)
The same rate that B will decrease done
clear
C)
Twice the rate that B will decrease done
clear
D)
The same rate that \[{{A}_{2}}B\] will form done
clear
View Solution play_arrow
-
question_answer14)
The rate of a gaseous reaction is given by the expression \[K\,[A]\,[B]\]. If the volume of the reaction vessel is suddenly reduced to 1/4th of the initial volume, the reaction rate relating to original rate will be [Roorkee 1992]
A)
1/10 done
clear
B)
1/8 done
clear
C)
8 done
clear
D)
16 done
clear
View Solution play_arrow
-
question_answer15)
A catalyst increases the rate of reaction because it [EAMCET 1992]
A)
Increases the activation energy done
clear
B)
Decreases the energy barrier for reaction done
clear
C)
Decreases the collision diameter done
clear
D)
Increases the temperature coefficient done
clear
View Solution play_arrow
-
question_answer16)
For the reaction \[{{N}_{2}}(g)+3{{H}_{2}}(g)\to 2N{{H}_{3}}(g)\] under certain conditions of temperature and partial pressure of the reactants, the rate of formation of \[N{{H}_{3}}\] is \[0.001\,kg\,{{h}^{-1}}\]. The rate of conversion of \[{{H}_{2}}\] under the same conditions is [IIT 1994]
A)
\[1.82\,\times {{10}^{-4}}\,kg/hr\] done
clear
B)
\[0.0015\,kg/hr\] done
clear
C)
\[1.52\times {{10}^{4}}kg/hr\] done
clear
D)
\[1.82\times {{10}^{-14}}kg/hr\] done
clear
View Solution play_arrow
-
question_answer17)
In the reaction \[2A+B\to {{A}_{2}}B\], if the concentration of \[A\] is doubled and of \[B\] is halved, then the rate of the reaction will [MP PET 1994; CBSE PMT 2000]
A)
Increase by four times done
clear
B)
Decrease by two times done
clear
C)
Increase by two times done
clear
D)
Remain the same done
clear
View Solution play_arrow
-
question_answer18)
The term \[\left( -\frac{dc}{dt} \right)\] in a rate equation refers to the [MP PMT 1996]
A)
Concentration of the reactant done
clear
B)
Decrease in concentration of the reactant with time done
clear
C)
Increase in concentration of the reactant with time done
clear
D)
Velocity constant of the reaction done
clear
View Solution play_arrow
-
question_answer19)
The rate of a reaction depends upon the [Pb. PMT 1999]
A)
Volume done
clear
B)
Force done
clear
C)
Pressure done
clear
D)
Concentration of reactant done
clear
View Solution play_arrow
-
question_answer20)
For a given reaction \[3A+B\to C+D\] the rate of reaction can be represented by [DCE 2000]
A)
\[-\frac{1}{3}\frac{d[A]}{dt}=\frac{-d[B]}{dt}=\frac{+d[C]}{dt}=\frac{+d[D]}{dt}\] done
clear
B)
\[-\frac{1}{3}\frac{d[A]}{dt}=\frac{d[C]}{dt}=K{{[A]}^{m}}{{[B]}^{n}}\] done
clear
C)
\[+\frac{1}{3}\frac{d[A]}{dt}=\frac{-d[C]}{dt}=K{{[A]}^{n}}{{[B]}^{m}}\] done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer21)
For the reaction \[{{N}_{2}}+3{{H}_{2}}\to 2N{{H}_{3}}\] if \[\frac{\Delta [N{{H}_{3}}]}{\Delta t}=2\times {{10}^{-4}}mol\,{{l}^{-1}}{{s}^{-1}},\] the value of \[\frac{-\Delta [{{H}_{2}}]}{\Delta t}\] would be [MP PMT 2000]
A)
\[1\times {{10}^{-4}}mol\,\,{{l}^{-1}}{{s}^{-1}}\] done
clear
B)
\[3\times {{10}^{-4}}mol\,\,{{l}^{-1}}{{s}^{-1}}\] done
clear
C)
\[4\times {{10}^{-4}}mol\,\,{{l}^{-1}}{{s}^{-1}}\] done
clear
D)
\[6\times {{10}^{-4}}mol\,{{l}^{-1}}{{s}^{-1}}\] done
clear
View Solution play_arrow
-
question_answer22)
A gaseous hypothetical chemical equation \[2A\]⇌\[4B+C\]is carried out in a closed vessel. The concentration of B is found to increase by \[5\times {{10}^{-3}}mol\,\,{{l}^{-1}}\] in 10 second. The rate of appearance of B is [AFMC 2001]
A)
\[5\times {{10}^{-4}}mol\,\,{{l}^{-1}}se{{c}^{-1}}\] done
clear
B)
\[5\times {{10}^{-5}}mol\,\,{{l}^{-1}}se{{c}^{-1}}\] done
clear
C)
\[6\times {{10}^{-5}}mol\,\,{{l}^{-1}}{{\sec }^{-1}}\] done
clear
D)
\[4\times {{10}^{-4}}mol\,{{l}^{-1}}{{\sec }^{-1}}\] done
clear
View Solution play_arrow
-
question_answer23)
The rate of a chemical reaction depends upon [AFMC 2002]
A)
Time done
clear
B)
Pressure done
clear
C)
Concentration done
clear
D)
All of these done
clear
View Solution play_arrow
-
question_answer24)
The rate of disappearance of \[S{{O}_{2}}\] in the reaction \[2S{{O}_{2}}+{{O}_{2}}\to 2S{{O}_{3}}\] is \[1.28\times {{10}^{-3}}g/sec\] then the rate of formation of \[S{{O}_{3}}\] is [JIPMER 2002]
A)
\[0.64\times {{10}^{-3}}g/sec\] done
clear
B)
\[0.80\times {{10}^{-3}}g/sec\] done
clear
C)
\[1.28\times {{10}^{-3}}g/sec\] done
clear
D)
\[1.60\times {{10}^{-3}}g/sec\] done
clear
View Solution play_arrow
-
question_answer25)
When the concentration of A in the reaction \[A+B\]⇌\[AB\] is doubled, the rate of reaction will be [MP PMT 2002]
A)
Doubled done
clear
B)
Decreased by half done
clear
C)
Unchanged done
clear
D)
Increased by four times done
clear
View Solution play_arrow
-
question_answer26)
The velocity of the chemical reaction doubles every \[{{10}^{o}}C\] rise of temperature. If the temperature is raised by \[{{50}^{o}}C\], the velocity of the reaction increases to about
A)
32 times done
clear
B)
16 times done
clear
C)
20 times done
clear
D)
50 times done
clear
View Solution play_arrow
-
question_answer27)
An increase in temperature by \[{{10}^{o}}C\], generally increases the rate of a reaction by
A)
2 times done
clear
B)
10 times done
clear
C)
9 times done
clear
D)
100 times done
clear
View Solution play_arrow
-
question_answer28)
The temperature coefficient for reaction in which food deteriorates is 2. Then food deteriorates ...... times as rapidly at \[{{25}^{o}}C\] as it does at \[{{5}^{o}}C\]
A)
Two done
clear
B)
Four done
clear
C)
Six done
clear
D)
Twenty done
clear
View Solution play_arrow
-
question_answer29)
The rate of a reaction is doubled for every \[{{10}^{o}}\] rise in temperature. The increase in reaction rate as a result of temperature rise from \[{{10}^{o}}\] to \[{{100}^{o}}\] is [KCET 1993; Kerala PET 2002; MP PET 2003]
A)
112 done
clear
B)
512 done
clear
C)
400 done
clear
D)
614 done
clear
View Solution play_arrow
-
question_answer30)
A catalyst increases the rate of a chemical reaction by [MNR 1988; CPMT 1999; Pb. PMT 2000]
A)
Increasing the activation energy done
clear
B)
Decreasing the activation energy done
clear
C)
Reacting with reactants done
clear
D)
Reacting with products done
clear
View Solution play_arrow
-
question_answer31)
Velocity constant of a reaction at 290 K was found to be\[3.2\times {{10}^{-3}}\]. At 310 K it will be about [KCET 1989, 91]
A)
\[1.28\times {{10}^{-2}}\] done
clear
B)
\[9.6\times {{10}^{-3}}\] done
clear
C)
\[6.4\times {{10}^{-3}}\] done
clear
D)
\[3.2\times {{10}^{-4}}\] done
clear
View Solution play_arrow
-
question_answer32)
The temperature coefficient of a reaction is
A)
Specific reaction rate at \[{{25}^{o}}C\] done
clear
B)
Rate of the reaction at \[{{100}^{o}}C\] done
clear
C)
Ratio of the rate constants at temperatures \[{{35}^{o}}C\] and \[{{25}^{o}}C\] done
clear
D)
Ratio of the rate constants at two temperatures differing by \[{{1}^{o}}C\] done
clear
View Solution play_arrow
-
question_answer33)
The main function of a catalyst in speeding up a reaction is
A)
To increase the rate of the forward reaction done
clear
B)
To change the reaction path so as to decrease the energy of activation for the reaction done
clear
C)
To reduce the temperature at which the reaction can occur done
clear
D)
To increase the energy of the molecules of the reactants done
clear
View Solution play_arrow
-
question_answer34)
The rate of a reaction [CPMT 1973]
A)
Increases with increase in temperature done
clear
B)
Decreases with increase in temperature done
clear
C)
Does not depend on temperature done
clear
D)
Does not depend on concentration done
clear
View Solution play_arrow
-
question_answer35)
Which of the following statements is false in relation to enzyme [MP PMT 2003]
A)
pH affects their functioning done
clear
B)
Temperature affects their functioning done
clear
C)
They always increase activation energy done
clear
D)
Their reactions are specific done
clear
View Solution play_arrow
-
question_answer36)
A reaction is catalysed by ?X ?. Here ?X ? [MP PMT 2003]
A)
Decreases the rate constant of reaction done
clear
B)
Does not affect the equilibrium constant of reaction done
clear
C)
Decreases the enthalpy of reaction done
clear
D)
Decreases the activation energy done
clear
View Solution play_arrow
-
question_answer37)
Which reaction characteristics are changing by the addition of a catalyst to a reaction at constant temperature (i) Activation energy (ii) Equilibrium constant (iii) Reaction entropy (iv) Reaction enthalpy [DCE 2003]
A)
(i) Only done
clear
B)
(iii) only done
clear
C)
(i) and I(ii) only done
clear
D)
All of these done
clear
View Solution play_arrow
-
question_answer38)
The velocity constant of a reaction at 290 K was found to be \[3.2\times {{10}^{-3}}\]. At 300 K it will be [MP PMT 2004]
A)
\[1.28\times {{10}^{-2}}\] done
clear
B)
\[6.4\times {{10}^{-3}}\] done
clear
C)
\[9.6\times {{10}^{-3}}\] done
clear
D)
\[3.2\times {{10}^{-4}}\] done
clear
View Solution play_arrow
-
question_answer39)
In which of the following cases, does the reaction go farthest to completion [UPSEAT 2001]
A)
\[K={{10}^{3}}\] done
clear
B)
\[K={{10}^{-2}}\] done
clear
C)
\[K=10\] done
clear
D)
\[K=1\] done
clear
View Solution play_arrow
-
question_answer40)
Rate of reaction [Pb. CET 2004]
A)
Decreases with increase in temperature done
clear
B)
Increases with increase in temperature done
clear
C)
May increase or decrease with increase in temperature done
clear
D)
Does not depend on temperature done
clear
View Solution play_arrow
-
question_answer41)
For the reaction\[2{{N}_{2}}{{O}_{5(g)}}\to 4N{{O}_{2(g)}}+{{O}_{2(g)}}\], if concentration of \[N{{O}_{2}}\] in 100 seconds is increased by \[5.2\times {{10}^{-3}}m\]. Then rate of reaction will be [Kerala CET 2005]
A)
\[1.3\times {{10}^{-5}}m{{s}^{-1}}\] done
clear
B)
\[5\times {{10}^{-4}}m{{s}^{-1}}\] done
clear
C)
\[7.6\times {{10}^{-4}}m{{s}^{-1}}\] done
clear
D)
\[2\times {{10}^{-3}}m{{s}^{-1}}\] done
clear
E)
\[2.5\times {{10}^{-5}}m{{s}^{-1}}\] done
clear
View Solution play_arrow
-
question_answer42)
A first order reaction complete its 10% in 20 minutes then time required to complete its 19% is [Kerala CET 2005]
A)
30 minutes done
clear
B)
40 minutes done
clear
C)
50 minutes done
clear
D)
38 minutes done
clear
E)
45 minutes done
clear
View Solution play_arrow