Entropy change of vaporisation at constant pressure is given by:

1. S(v)= HvT                 2. S(v)=UvT3. S(v)= HvT                 4. none of these

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Spontaneity and Entropy
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What is the entropy change for the reaction given below, 

2H2 (g) + O2 (g) 2H2O(l)

at temperature 300 K? Standard entropies of H2 (g), O2(g) and H2O(l) are 126.6, 201.20 and 68.0 JK-1mol-1 respectively.

(a) -318.4 JK-1mol-1                           (b) 318.4 JK-1mol-1 

(c) 31.84 JK-1mol-1                             (d) none of these

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Spontaneity and Entropy
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If S° for H2, Cl2 and HCl are 0.13, 0.22 and 0.19 kJ K-1mol-1 respectively. The total change in standard entropy for the reaction, H2 + Cl2 2HCl is:

(a) 30 J K-1mol-1                         (b) 40 J K-1mol-1

(c) 60 J K-1mol-1                         (d) 20 J K-1mol-1

Concept Questions :-

Spontaneity and Entropy
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The direct conversion of A to B is difficult and thus it is converted by path ACDB. Given

Where e.u. is the entropy unit, then SAB is:

(a) +60 e.u                                       (b) +100 e.u

(c) -60 e.u                                        (d) -100 e.u

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In a flask, colourless N2O4(g) is in equilibrium with brown coloured NO2(g). At equilibrium when the flask is heated to 100°C, the brown colour deepens and on cooling it becomes coloured. Which statement is incorrect about this observation?

(a) The H for the reaction N2O4(g) 2NO2(g) is +ve

(b) Paramagnetism increases on heating

(c) The H-U at 100°C is equal to 200 cal

(d) Dimerisation is reduced on heating

Concept Questions :-

First Law of Thermodynamics
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Enthalpy of the reaction,

 CH4(g) + 1/2 O2(g) CH3OH (l), is negative. If enthalpy of combustion of CH4 and CH3OH are x and y respectively, then which relation is correct?                                 

(a) x>y         (b) x<y          (c) x=y           (d) xy

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In the reaction, H and S both are positive. In which of the following cases, the reaction would not be spontaneous?

(a) H>TS                              (b) S=H/T

(c) H=TS                               (d) All of these

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When an ideal gas is compressed adiabatically and reversibly, the final temperature is:

(a) higher than the initial temperature

(b) lower than the initial temperature

(c) the same as the initial temperature

(d) dependent on the rate of compression

Concept Questions :-

First Law of Thermodynamics
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1 litre-atmosphere is equal to:

(a) 101.3 J                           (b) 24.206 cal

(c) 101.3 x 107 erg               (d) all of these

Concept Questions :-

First Law of Thermodynamics
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The standard change is Gibbs energy for the reaction,

H2OH+ + OH- at 25°C is:

1. 100 kJ                         2. -90 kJ

3. 90 kJ                           4. -100 kJ

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Spontaneity and Entropy
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