question_answer 1)
Which of the following is not the extensive property?
A)
Gibbs free energy done
clear
B)
Enthalpy done
clear
C)
Entropy done
clear
D)
Viscosity done
clear
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question_answer 2)
If (i) \[\Delta H_{f}^{o}\] (benzene)\[=-358.5\,\,kJ\,\,mo{{l}^{-1}}\]. (ii) Heat of atomization of graphite\[=716.8\,\,kJ\,mo{{l}^{-1}}\]. (iii) Bond energy of \[C-H,\,\,C-C,\,\,C=C\] and \[H-H\] bonds are 490, 340, 620 and\[436.9\,\,kJ\,\,mo{{l}^{-1}}\] respectively. The resonance energy (in \[kJ\,\,mo{{l}^{-1}}\]) of \[{{C}_{6}}{{H}_{6}}\] using Kekule formula is
A)
- 150 done
clear
B)
- 50 done
clear
C)
- 250 done
clear
D)
+150 done
clear
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question_answer 3)
Which of the following parameter is correct regarding adsorption of gases over solid?
A)
\[\Delta {{S}_{system}}>0\] done
clear
B)
\[\Delta {{S}_{surronunding}}>0\] done
clear
C)
\[\Delta G>0\] done
clear
D)
\[\Delta H>0\] done
clear
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question_answer 4)
Which of the following defines enthalpy of solution?
A)
\[{{H}_{2}}O(l)\xrightarrow[{}]{{}}{{H}^{+}}(aq)+O{{H}^{-}}(aq)\] done
clear
B)
\[N{{H}_{4}}Cl(s)\xrightarrow[{}]{{}}NH_{4}^{+}(aq)+C{{l}^{-}}(aq)\] done
clear
C)
\[CuS{{O}_{4}}\cdot 5{{H}_{2}}O(s)+{{H}_{2}}O\xrightarrow[{}]{{}}CuS{{O}_{4}}(aq)\] done
clear
D)
\[CuS{{O}_{4}}(s)+5{{H}_{2}}O\xrightarrow[{}]{{}}CuS{{O}_{4}}\cdot 5{{H}_{2}}O(s)\] done
clear
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question_answer 5)
The tendency of a reaction to take place spontaneously is greatest when the reaction is
A)
Exothermic and randomness increases done
clear
B)
Endothermic & randomness increases done
clear
C)
Exothermic and randomness decreases done
clear
D)
Endothermic & randomness decreases done
clear
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question_answer 6)
Which of the following reactions corresponds to the definition of enthalphy of formation?
A)
C (diamond) \[+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] done
clear
B)
C (graphite) \[+{{O}_{2}}(l)\to C{{O}_{2}}(g)\] done
clear
C)
C (graphite) \[+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] done
clear
D)
\[C(g)+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] done
clear
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question_answer 7)
Which of the following combustion reactions would give maximum energy output per unit mass fuel plus oxidant when used to propel a rocket?
A)
\[C(s)+{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g),\,\,\Delta H=-394\,KJ/mol\] done
clear
B)
\[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}{{H}_{2}}O(l),\,\Delta H=-285\,kJ/mol\] done
clear
C)
\[\frac{1}{2}{{H}_{2}}+\frac{1}{2}{{F}_{2}}\xrightarrow{{}}2HF(g),\,\Delta H=-271\,kJ/mol\] done
clear
D)
\[C{{H}_{4}}+2{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g)+2{{H}_{2}}O(l),\]\[\Delta H=-890\,kJ/mol\] done
clear
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question_answer 8)
A 1 g sample of octane \[{{C}_{8}}{{H}_{18}}\] is burned in excess of oxygen in a bomb calorimeter. The temperature of the calorimeter rises from 294 K to 300 K. If heat capacity of the calorimeter is 8 kJ/K, the enthalpy of combustion of octane is
A)
5472 kJ/mol done
clear
B)
48 kJ/mol done
clear
C)
684 kJ/mol done
clear
D)
4281 kJ/mol done
clear
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question_answer 9)
The polymerization of ethylene to linear polyethylene is represented by the reaction \[nC{{H}_{2}}=C{{H}_{2}}\xrightarrow{\,}\,{{(-C{{H}_{2}}-C{{H}_{2}}-)}_{n}}\] when 'n' has a large integral value. Given that average enthalpies of bond dissociation for \[C=C\] and \[C-C\] at 298 K are + 590 and \[+331\,\,kJ\,\,mo{{l}^{-1}}\] respectively. Then the enthalpy of polymerization/mol of ethylene at298 K is
A)
- 132 kJ done
clear
B)
- 72 kJ done
clear
C)
+ 80 kJ done
clear
D)
+ 162 kJ done
clear
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question_answer 10)
Select the incorrect option about spontaneous exothermic reaction.
A)
\[\Delta {{S}_{surr}}=+ve\] done
clear
B)
\[\Delta {{S}_{Overall}}=+ve\] done
clear
C)
\[\Delta {{S}_{System}}may=-ve\] done
clear
D)
\[\Delta {{S}_{System}}=+ve\,\,\text{always}\] done
clear
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question_answer 11)
The standard heat of combustion of Al is \[-\,837.8\,kJ\,mo{{l}^{-1}}\] at \[{{25}^{o}}C\]. If Al reacts with \[{{O}_{2}}\] at \[{{25}^{o}}C,\] which of the following releases 250 kcal of heat?
A)
The reaction of 0.624 mole of Al done
clear
B)
The formation of 0.624 mole of \[A{{l}_{2}}{{O}_{3}}\] done
clear
C)
The reaction of 0.312 mole of Al done
clear
D)
The formation of 0.150 mole of \[A{{l}_{2}}{{O}_{3}}\] done
clear
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question_answer 12)
The heat of hydration of solution anhydrous \[CuS{{O}_{4}}\] and hydrated \[CuS{{O}_{4}}\cdot 5{{H}_{2}}O\] are - 66.5 and 11.7 kJ \[mo{{l}^{-1}}\]respectively. Calculate the heat of hydration of \[CuS{{O}_{4}}\] to \[CuS{{O}_{4}}\cdot 5{{H}_{2}}O\]
A)
- 78.2 kJ done
clear
B)
- 81.2 kJ done
clear
C)
- 68.2 kJ done
clear
D)
- 60.1 kJ done
clear
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question_answer 13)
State which of the following statements is true?
A)
First law of thermodynamics is not adequate in predicting the direction of the process. done
clear
B)
In an exothermic reaction, the total enthalpy of the products is greater than that of reactants. done
clear
C)
The standard enthalpy of diamond is zero at 298K and 1 atm pressure. done
clear
D)
It is possible to calculate the value of \[\Delta H\] for the reaction \[{{H}_{2}}(g)+B{{r}_{2}}(\ell )\to 2HBr(g)\] from the bond enthalpy data. done
clear
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question_answer 14)
In an adiabatic process non-transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following.
A)
\[q=0,\Delta T,w=0\] done
clear
B)
\[q\ne 0,\Delta T=0,w=0\] done
clear
C)
\[q=0,\Delta T=0,w=0\] done
clear
D)
\[q=0,\Delta t<0,w\ne 0\] done
clear
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question_answer 15)
For a gaseous reaction: \[2{{A}_{2}}(g)+5{{B}_{2}}(g)\to 2{{A}_{2}}{{B}_{5}}(g)\] at \[{{27}^{o}}C\] the heat change at constant pressure is found to be \[-\,50160\,J\]. Calculate the value of internal energy change \[(\Delta E)\]. Given that R = 8.314 J/K mol.
A)
- 34689 J done
clear
B)
- 37689 J done
clear
C)
- 27689 J done
clear
D)
- 38689 J done
clear
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question_answer 16)
The gaseous endothermic reaction : \[P+Q\to 3R\] at \[327{}^\circ C\] takes place spontaneously, because-
A)
\[\Delta H<0;\,\Delta S<0\] done
clear
B)
\[\Delta H>0;\,\Delta S>0\] done
clear
C)
\[\Delta H<0;\,\Delta S>0\] done
clear
D)
\[\Delta H>0;\,\Delta S<0\] done
clear
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question_answer 17)
The difference between the heats of reaction at constant pressure and a constant volume for the reaction \[2{{C}_{6}}{{H}_{6\left( 1 \right)}}+15{{O}_{2(g)}}\xrightarrow{{}}12C{{O}_{2(g)}}+6{{H}_{2}}{{O}_{(I)}}\] in Kj is :
A)
- 7.43 done
clear
B)
+ 3.72 done
clear
C)
- 3.72 done
clear
D)
+ 7.43 done
clear
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question_answer 18)
The enthalpy of combustion of \[{{H}_{2}}(g),\] to give\[{{H}_{2}}(g)\] is \[-249\text{ }kJ\text{ }mo{{l}^{-1}}\] and bond enthalpies of \[H-H\] and \[O=O\] are \[433\text{ }kJ\text{ }mo{{l}^{-1}}\] and \[492\text{ }kJ\text{ }mo{{l}^{-1}}\] respectively. The bond enthalpy of \[O-H\] is
A)
\[464\text{ }kJ\text{ }mo{{l}^{-1}}\] done
clear
B)
\[-464\text{ }kJ\text{ }mo{{l}^{-1}}\] done
clear
C)
\[232\text{ }kJ\text{ }mo{{l}^{-1}}\] done
clear
D)
\[-232\text{ }kJ\text{ }mo{{l}^{-1}}\] done
clear
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question_answer 19)
Use the bond enthalpies in the table to determine \[\Delta H{}^\circ \] for the formation of hydrazine, \[{{N}_{2}}{{H}_{4}}(g)\] from nitrogen and hydrogen in standard state according to the equation : \[{{N}_{2}}(g)+2{{H}_{2}}(g)\xrightarrow{{}}{{N}_{2}}{{H}_{4}}(g)\]
Bond
Bond enthalpies
\[N-N\]
\[159\text{ }kJ\text{ }mo{{l}^{-1}}\]
\[N=N\]
\[418\text{ }kJ\text{ }mo{{l}^{-1}}\]
\[N\equiv N\]
\[941\text{ }kJ\text{ }mo{{l}^{-1}}\]
\[H-H\]
\[436\text{ }kJ\text{ }mo{{l}^{-1}}\]
\[H-N\]
\[389\text{ }kJ\text{ }mo{{l}^{-1}}\]
A)
\[\Delta H{}^\circ =-425\text{ }kJ\] done
clear
B)
\[\Delta H{}^\circ =-\text{ }98\text{ }kJ\] done
clear
C)
\[\Delta H{}^\circ =+\text{ }98\text{ }kJ\] done
clear
D)
\[\Delta H{}^\circ =+\text{ }711\,kJ\] done
clear
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question_answer 20)
The Solvay process for making \[N{{a}_{2}}C{{O}_{3}}\] involves the reaction \[2NaHC{{O}_{3}}N{{a}_{2}}C{{O}_{3}}(s)+{{H}_{2}}O(g)+C{{O}_{2}}(g)\] For this reaction \[\Delta {{H}^{o}}=129.2\,kJ/mol,\] \[\Delta {{S}^{o}}=334.2\,J/mol-K\]. From this information, the minimum temperature at which this reaction becomes spontaneous is:
A)
\[460{}^\circ C\] done
clear
B)
\[1017{}^\circ C\] done
clear
C)
\[113{}^\circ C\] done
clear
D)
the reaction is spontaneous at all temperatures done
clear
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question_answer 21)
Given the following standard enthalpies of formation, which elements will react exothermically with \[Si{{O}_{2}}(s)\] to make Si(s)?
Compounds \[\Delta H_{f}^{o}kJ/mol\] \[Si{{O}_{2}}(s)\] - 910 \[MgO(s)\] - 601 \[C{{r}_{2}}{{O}_{3}}(s)\] - 1128 \[C{{O}_{2}}(g)\] - 393 \[L{{i}_{2}}O(s)\] - 598
A)
Cr only done
clear
B)
Mg and Li only done
clear
C)
C, Li and Cr done
clear
D)
Li only done
clear
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question_answer 22)
For an endothermic reaction, where \[\Delta H\] represents the enthalpy of the reaction, the minimum value for the energy of activation will be
A)
less than \[\Delta H\] done
clear
B)
zero done
clear
C)
more than \[\Delta H\] done
clear
D)
equal to \[\Delta H\] done
clear
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question_answer 23)
Consider the following reaction occuring in an automobile engine : \[2{{C}_{8}}{{H}_{18}}(l)+25\,{{O}_{2}}(g)\to 16\,C{{O}_{2}}(g)+18\,{{H}_{2}}O(g)\] of \[\Delta H,\,\Delta S\] and \[\Delta G\] would be:
A)
- + + done
clear
B)
- - + done
clear
C)
+ + - done
clear
D)
- + - done
clear
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question_answer 24)
A coffee cup calorimeter initially contains 125 g of water, at a temperature of \[24.2{}^\circ C\]. 8 g of ammonium nitrate \[(N{{H}_{4}}N{{O}_{3}}),\] also at \[24.2{}^\circ C,\] is added to the water, and the final temperature is \[18.2{}^\circ C\] what is the heat of solution of ammonium nitrate in kJ/mol? The specific heat capacity of the solution is \[4.2\text{ }J/{}^\circ Cg\].
A)
33.51 kJ/mol done
clear
B)
39.5 kJ/mol done
clear
C)
32.2 kJ/mol done
clear
D)
37.3 kJ/mol done
clear
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question_answer 25)
Calculate the heat change in the reaction \[4\,N{{H}_{3}}(g)+3{{O}_{2}}(g)\to 2{{N}_{2}}(g)+6{{H}_{2}}O(\ell )\] at 298 K, given that the heats of formation at 298 K for \[N{{H}_{3}}(g)\] and \[{{H}_{2}}O(\ell )\] are - 46.0 and - 28.60 kJ \[mo{{l}^{-1}}\] respectively.
A)
- 1861 kJ done
clear
B)
- 1361 kJ done
clear
C)
- 1261 kJ done
clear
D)
- 1532 kJ done
clear
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question_answer 26)
The in \[{{\Delta }_{f}}H{}^\circ ({{N}_{2}}{{O}_{5}},g)\] kJ/mol on the basis of the following data is -
\[2NO(g)+{{O}_{2}}(g)\to 2N{{O}_{2}}(g);\]\[{{\Delta }_{r}}H{}^\circ =-114\,kJ/mol\]
\[4N{{O}_{2}}(g)+{{O}_{2}}(g)\to 2{{N}_{2}}{{O}_{5}}(g);\]\[{{\Delta }_{r}}H{}^\circ =-102.6\,kJ/mol\]
\[{{\Delta }_{f}}H{}^\circ (NO,g)=90.2kJ/mol\]
A)
15.1 done
clear
B)
30.2 done
clear
C)
- 36.2 done
clear
D)
None of these done
clear
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question_answer 27)
Which of the following expressions represents the first law of thermodynamics?
A)
\[\Delta E=-q+W\] done
clear
B)
\[\Delta E=q-W\] done
clear
C)
\[\Delta E=q+W\] done
clear
D)
\[\Delta E=-q-W\] done
clear
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question_answer 28)
If heat of dissociation of \[CHC{{l}_{2}}COOH\] is 0.7 kcal/mol, then \[\Delta H\] for the reaction: \[CHC{{l}_{2}}COOH+KOH\to CHC{{l}_{2}}COOK+{{H}_{2}}O\]
A)
- 13 kcal done
clear
B)
+ 13 kcal done
clear
C)
- 14.4 kcal done
clear
D)
- 13.7 kcal done
clear
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question_answer 29)
One gram of an organic liquid X (molecular mass 78) liberates 160 J of heat on solidification. \[\Delta {{H}_{fusion}}\,\,(A)\] is:
A)
19.2 kJ/mol done
clear
B)
12.48 kJ/mol done
clear
C)
124.8 kJ/mol done
clear
D)
None of these done
clear
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question_answer 30)
The \[\Delta H_{F}^{O}\] for \[C{{O}_{2}}(g),\,\,CO(g)\] and \[{{H}_{2}}O(g)\] are \[-\,393.5,\,-110.5\] and \[-\,241.8\text{ }kJ\text{ }mol\], respectively. The standard enthalpy change (in kJ) for the reaction \[C{{O}_{2(g)}}+{{H}_{2}}_{(g)}\xrightarrow{{}}C{{O}_{(g)}}+{{H}_{2}}{{O}_{(g)}}\] is:
A)
+ 524.1 done
clear
B)
+ 41.2 done
clear
C)
- 262.5 done
clear
D)
- 41.2 done
clear
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question_answer 31)
The standard heat of combustion of Al is - 837.8 kJ/mol at \[25{}^\circ C\]. Which of the following releases 250 kcal of heat?
A)
The reaction of 0.624 mol of Al done
clear
B)
The formation of 0.624 mol of \[A{{l}_{2}}{{O}_{3}}\] done
clear
C)
The reaction of 0.312 mol of \[Al\] done
clear
D)
The formation of 0.150 mol of \[A{{l}_{2}}{{O}_{3}}\] done
clear
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question_answer 32)
A child bought a balloon which became very small in size the next day. Which is correct statement about balloon?
A)
It is isolated system done
clear
B)
It is an open system done
clear
C)
It is a closed system done
clear
D)
it exchanges only energy with the surrounding. done
clear
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question_answer 33)
The enthalpies of formation of \[A{{l}_{2}}{{O}_{3}}\] and \[C{{r}_{2}}{{O}_{3}}\] 1596 kJ and - 1134 kJ respectively. \[\Delta H\] for the reaction \[2Al+C{{r}_{2}}{{O}_{3}}\to 2Cr+A{{l}_{2}}{{O}_{3}}\]
A)
- 2730 kJ done
clear
B)
- 462 kJ done
clear
C)
- 1365 kJ done
clear
D)
+ 2730 kJ done
clear
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question_answer 34)
Calculate \[\Delta {{H}^{o}}\] for evaporation of \[{{H}_{2}}O(l)\] \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\xrightarrow{\,}\,{{H}_{2}}O(l);\Delta H=285.77\,\,kJ\] ?(i) \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\xrightarrow{\,}\,{{H}_{2}}O(g);\,\Delta H=241.84\,\,kJ\]?(ii)
A)
+ 43.93 kJ done
clear
B)
- 43.93 kJ done
clear
C)
527.61 kJ done
clear
D)
- 527.61 kJ done
clear
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question_answer 35)
The heat of neutralization of four acids A, B, C, D are -13.7, -9.4, - 11.2 and - 12.4 kcal, respectively, when they are neutralized by a common base. The acidic character obeys the order:
A)
A > B > C < D done
clear
B)
A > D > C> B done
clear
C)
D > C > B > A done
clear
D)
D > B > C > A done
clear
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