# Standard enthalpy of vaporization ${∆}_{\mathrm{vap}}{\mathrm{H}}^{0}$for 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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Which of the following is the correct option for free expansion of an ideal gas under adiabatic condition?
1.
2.
3.
4.

Subtopic:  2nd & 3rd Law of Thermodynamics |
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Given the following reaction:
4H(g) 2H2 (g)
The enthalpy change for the reaction is -869.6 kJ. The dissociation energy of the H-H bond is -
1. -869.6 kJ
2. +434.8kJ
3. +217.4kJ
4. -434.8 kJ

Subtopic:  Enthalpy & Internal energy |
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Standard entropies of X2, Y2 and XY3 are 60, 40 and 50JK-1mol-1 respectively. For the reaction
to  be at equilibrium, the temperature should be

1. 750 K

2. 1000 K

3. 1250 K

4. 500 K

Subtopic:  Gibbs Energy Change |
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From the following bond energies :

H—H bond energy: 431.37 kJ mol-1
C=C bond energy: 606.10 kJ mol-1
C—C bond energy: 336.49 kJ mol-1
C—H bond energy: 410.50 kJ mol-1

Enthalpy for the reaction,

will be

1. 1523.6 kJ mol-1

2. -243.6 kJ mol-1

3. -120.0 kJ mol-1

4. 553.0 kJ mol-1

Subtopic:  Thermochemistry |
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The values of ΔH and ΔS for the reaction, C(graphite) + CO2(g)→2CO(g) are 170 kJ and 170 JK-1, respectively. This reaction will be spontaneous at
1. 710 K
2. 910 K
3. 1110 K
4. 510 K

Subtopic:  Gibbs Energy Change |
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Which of the following are not state functions?
(I) q + W
(II) q
(III) W
(IV) H - TS

1.  (I) and (IV)

2.  (II), (III) and (IV)

3.  (I), (II) and (III)

4.  (II) and (III)

Subtopic:  Gibbs Energy Change |
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For the gas phase reaction,
${\mathrm{PCl}}_{5}\left(\mathrm{g}\right)⇌{\mathrm{PCl}}_{3}\left(\mathrm{g}\right)+{\mathrm{Cl}}_{2}\left(\mathrm{g}\right)$
which of the following conditions are correct?

1.  ΔH = 0 and ΔS < 0

2.  ΔH > 0 and ΔS > 0

3.  ΔH < 0 and ΔS < 0

4.  ΔH > 0 and ΔS < 0

Subtopic:  Gibbs Energy Change |
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The standard free energies of formation(in kJ/mol) at 298 K are -237.2, -394.4 and -8.2 for H2O(l), CO2(g) and pentane (g), respectively. The value of Ecell for the pentane-oxygen fuel cell is:

1.  1.968 V
2.  2.0968 V
3.  1.0968 V
4.  0.0968 V

Subtopic:  Gibbs Energy Change |
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Bond dissociation enthalpy of H2, Cl2 and HCl are 434, 242 and 431 kJ mol1 respectively. Enthalpy of formation of HCl is

1.  93 kJ mol-1
2.  - 245 kJ mol-1
3.  -93 kJ mol-1
4.  245 kJ mol-1

Subtopic:  Thermochemistry |
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