The heat of combustion of carbon to CO2 is -393.5 KJ/mol. The heat changed upon the formation of 35.2 g of CO2 from carbon and oxygen gas is -
1. -315 KJ
2. +315 KJ
3. -630 KJ
4. +630 KJ

Subtopic:  Thermochemistry |
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Which of the following statements is correct for a reversible process in a state of equilibrium?
1. G = - 2.30RT log K
2. G = 2.30RT log K
3. Go = - 2.30RT log K
4. Go = 2.30RT log K

Subtopic:  Gibbs Energy Change |
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Given the Gibbs free energy change, \(\Delta G^\circ=+63.3~kJ,\) for the following reaction, 
\(Ag_2 CO_3 (g) \rightarrow 2Ag^+ (aq) + CO^{2-}_3 (aq)\)
\(K_{sp}\) of \(Ag_2CO_3 (s) \) in water at 25º C is (R = 8.314 JK-1 mol-1)

1. \(3.2 \times 10^{26}\)
2. \(8.0 \times 10^{-12}\)
3. \(2.9 \times 10^{-3}\)
4. \(7.9 \times 10^{-2}\)
Subtopic:  Gibbs Energy Change |
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Which of the following statements is correct for the spontaneous adsorption of a gas ?

1. S is negative and therefore, H should be highly positive
2. S is negative and therefore, H should be highly negative
3. S is positive and therefore, H should be negative
4. S is positive and therefore, H should also be highly positive

Subtopic:  Spontaneity & Entropy |
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For the reaction : 
X2O4(l) → 2XO2(g) 
ΔU = 2.1 kcal, ΔS = 20 cal K–1 at 300 K 
The value of ΔG is -
1. 2.7 kcal
2. -2.7 kcal
3. 9.3 kcal
4. -9.3 kcal

Subtopic:  Gibbs Energy Change |
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In which of the following reactions, standard reaction entropy change (S0) is positive and standard Gibb's energy change (G0) decreases sharply with increasing temperature?

1. C(graphite)+12O2(g)CO(g)

2. CO(g)+12O2(g)CO2(g)

3. Mg(s)+12O2(g)MgO(s)

4. 12C(graphite)+12O2(g)12CO2(g)

Subtopic:  Gibbs Energy Change |
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The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0oC is

1. 10.52 cal/(mol K)

2. 21.04 cal/(mol K)

3. 5.260 cal/(mol K)

4. 0.526 cal/(mol K)

Subtopic:  Thermochemistry |
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Standard enthalpy of vaporization vapH0for water at 1000C is 40.66 Kj mol-1. The internal energy of vaporization of water at 1000C (in kJ mol-1) is 
(Assume water vapour to behave like an ideal gas).

1. +37.56

1. -43.76

3. +43.76

4. +40.66

Subtopic:  Enthalpy & Internal energy |
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Equal volumes of two monoatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats (Cp/Cv) of the mixture will be -
1.  1.50
2.  3.3
3.  1.67
4.  0.83

Subtopic:  Cp & Cv |
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Which of the following is the correct option for free expansion of an ideal gas under adiabatic condition?
1.  q0, T=0, W=0
2.  q=0, T=0, W=0
3.  q=0, T<0, W0
4.  q=0, T0, W=0

Subtopic:  2nd & 3rd Law of Thermodynamics |
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