Absolute Entropy and Third Law of Thermodynamics
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CHXI06:THERMODYNAMICS

369274 Consider the reactions at \(300 \mathrm{~K}\)
(a) \(4{\text{N}}{{\text{O}}_2}\left( {\text{g}} \right) + {{\text{O}}_2}\left( {\text{g}} \right) \to 2\;{{\text{N}}_2}{{\text{O}}_5}\left( {\text{g}} \right);\Delta {\text{H}} = - 111\,\;{\text{kJ}}\)
(b) \(4{\text{N}}{{\text{O}}_2}\left( {\text{g}} \right) + {{\text{O}}_2}\left( {\text{g}} \right) \to 2 {{\text{N}}_2}{{\text{O}}_5}\left( s \right);\Delta {\text{H}} = - 219\;{\text{kJ}}\)
Thus entropy change for the sublimation of one mole \({{\text{N}}_2}{{\text{O}}_5}\left( s \right)\) is :

1 \(180 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
2 \(360 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
3 \(108 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
4 \(54 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
CHXI06:THERMODYNAMICS

369275 In which of the following process entropy increases?
(I) Rusting of iron
(II) Vapourisation of Camphor
(III) Crystallisation of sugar from syrup
(IV) Atomisation of dihydrogen

1 I and II
2 II and III
3 II and IV
4 Only IV
CHXI06:THERMODYNAMICS

369276 For the reaction, \(\mathrm{2 \mathrm{SO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{SO}_{3(\mathrm{~g})}}\), the entropy

1 Increases
2 Decreases
3 Remains unchanged
4 Change cannot be predicted
CHXI06:THERMODYNAMICS

369277 Assertion :
Chlorine when solidified does not have zero entropy even at absolute zero.
Reason :
Chlorine is a pungent smelling gas and it is difficult to solidify it.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXI06:THERMODYNAMICS

369274 Consider the reactions at \(300 \mathrm{~K}\)
(a) \(4{\text{N}}{{\text{O}}_2}\left( {\text{g}} \right) + {{\text{O}}_2}\left( {\text{g}} \right) \to 2\;{{\text{N}}_2}{{\text{O}}_5}\left( {\text{g}} \right);\Delta {\text{H}} = - 111\,\;{\text{kJ}}\)
(b) \(4{\text{N}}{{\text{O}}_2}\left( {\text{g}} \right) + {{\text{O}}_2}\left( {\text{g}} \right) \to 2 {{\text{N}}_2}{{\text{O}}_5}\left( s \right);\Delta {\text{H}} = - 219\;{\text{kJ}}\)
Thus entropy change for the sublimation of one mole \({{\text{N}}_2}{{\text{O}}_5}\left( s \right)\) is :

1 \(180 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
2 \(360 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
3 \(108 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
4 \(54 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
CHXI06:THERMODYNAMICS

369275 In which of the following process entropy increases?
(I) Rusting of iron
(II) Vapourisation of Camphor
(III) Crystallisation of sugar from syrup
(IV) Atomisation of dihydrogen

1 I and II
2 II and III
3 II and IV
4 Only IV
CHXI06:THERMODYNAMICS

369276 For the reaction, \(\mathrm{2 \mathrm{SO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{SO}_{3(\mathrm{~g})}}\), the entropy

1 Increases
2 Decreases
3 Remains unchanged
4 Change cannot be predicted
CHXI06:THERMODYNAMICS

369277 Assertion :
Chlorine when solidified does not have zero entropy even at absolute zero.
Reason :
Chlorine is a pungent smelling gas and it is difficult to solidify it.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXI06:THERMODYNAMICS

369274 Consider the reactions at \(300 \mathrm{~K}\)
(a) \(4{\text{N}}{{\text{O}}_2}\left( {\text{g}} \right) + {{\text{O}}_2}\left( {\text{g}} \right) \to 2\;{{\text{N}}_2}{{\text{O}}_5}\left( {\text{g}} \right);\Delta {\text{H}} = - 111\,\;{\text{kJ}}\)
(b) \(4{\text{N}}{{\text{O}}_2}\left( {\text{g}} \right) + {{\text{O}}_2}\left( {\text{g}} \right) \to 2 {{\text{N}}_2}{{\text{O}}_5}\left( s \right);\Delta {\text{H}} = - 219\;{\text{kJ}}\)
Thus entropy change for the sublimation of one mole \({{\text{N}}_2}{{\text{O}}_5}\left( s \right)\) is :

1 \(180 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
2 \(360 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
3 \(108 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
4 \(54 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
CHXI06:THERMODYNAMICS

369275 In which of the following process entropy increases?
(I) Rusting of iron
(II) Vapourisation of Camphor
(III) Crystallisation of sugar from syrup
(IV) Atomisation of dihydrogen

1 I and II
2 II and III
3 II and IV
4 Only IV
CHXI06:THERMODYNAMICS

369276 For the reaction, \(\mathrm{2 \mathrm{SO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{SO}_{3(\mathrm{~g})}}\), the entropy

1 Increases
2 Decreases
3 Remains unchanged
4 Change cannot be predicted
CHXI06:THERMODYNAMICS

369277 Assertion :
Chlorine when solidified does not have zero entropy even at absolute zero.
Reason :
Chlorine is a pungent smelling gas and it is difficult to solidify it.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXI06:THERMODYNAMICS

369274 Consider the reactions at \(300 \mathrm{~K}\)
(a) \(4{\text{N}}{{\text{O}}_2}\left( {\text{g}} \right) + {{\text{O}}_2}\left( {\text{g}} \right) \to 2\;{{\text{N}}_2}{{\text{O}}_5}\left( {\text{g}} \right);\Delta {\text{H}} = - 111\,\;{\text{kJ}}\)
(b) \(4{\text{N}}{{\text{O}}_2}\left( {\text{g}} \right) + {{\text{O}}_2}\left( {\text{g}} \right) \to 2 {{\text{N}}_2}{{\text{O}}_5}\left( s \right);\Delta {\text{H}} = - 219\;{\text{kJ}}\)
Thus entropy change for the sublimation of one mole \({{\text{N}}_2}{{\text{O}}_5}\left( s \right)\) is :

1 \(180 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
2 \(360 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
3 \(108 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
4 \(54 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)
CHXI06:THERMODYNAMICS

369275 In which of the following process entropy increases?
(I) Rusting of iron
(II) Vapourisation of Camphor
(III) Crystallisation of sugar from syrup
(IV) Atomisation of dihydrogen

1 I and II
2 II and III
3 II and IV
4 Only IV
CHXI06:THERMODYNAMICS

369276 For the reaction, \(\mathrm{2 \mathrm{SO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{SO}_{3(\mathrm{~g})}}\), the entropy

1 Increases
2 Decreases
3 Remains unchanged
4 Change cannot be predicted
CHXI06:THERMODYNAMICS

369277 Assertion :
Chlorine when solidified does not have zero entropy even at absolute zero.
Reason :
Chlorine is a pungent smelling gas and it is difficult to solidify it.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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