If for a certain reaction ${∆}_{r}H$ is 30 kJ mol–1 at 450 K, the value of ${∆}_{r}S$ (in JK–1 mol–1) for which the same reaction will be spontaneous at the same temperature is: 1. 70 2. –33 3. 33 4. -70

Subtopic:  Spontaneity & Entropy |
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Consider the following processes :

∆H (kJ/mol)
½ A → B                            + 150
3B → 2C + D                      –125
E + A → 2D                        +350

For B + D → E + 2C, ∆H will be-

1. 325 kJ/mol

2. 525 kJ/mol

3. –175 kJ.mol

4. –325 kJ/mol

Subtopic:  Enthalpy & Internal energy |
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For vaporization of water at 1 atmospheric pressure, the values of ∆H and ∆S are 40.63 kJ mol–1 and 108.8 JK–1 mol–1, respectively. The temperature when Gibbs energy change (∆G) for this transformation will be zero, is -

1. 393.4 K

2. 373.4 K

3. 293.4 K

4. 273.4 K

Subtopic:  Gibbs Energy Change |
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Three moles of an ideal gas expanded spontaneously into vaccum. The work done will be

1. 3 Joules

2. 9 Joules

3. Zero

4. Infinite

Subtopic:  First Law of Thermodynamics |
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The following two reactions are known

The value of $∆$H for the following reaction

$F{e}_{2}{O}_{3}\left(s\right)+CO\left(g\right)\to 2FeO\left(s\right)+C{O}_{2}\left(g\right)$ is

1. -43.3 kJ

2. -10.3 kJ

3. +6.2 kJ

4. +10.3 kJ

Subtopic:  Enthalpy & Internal energy |
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Match List – I (Equations) with List – II (Type of processes) and select the correct option.

List –I                                    List – II
Equation                             Type of processes

(a) Kp > Q                           (i) Non spontaneous
(b) ∆Gº < RT ln Q                 (ii) Equilibrium
(c) Kp = Q                           (iii) Spontaneous and endothermic
(d) T > $\frac{∆H}{∆S}$                       (iv) Spontaneous

Options :
(a)  (b)  (c)   (d)
1. (iii)  (iv)  (ii)   (i)
2. (iv)   (i)   (ii)   (iii)
3. (ii)    (i)   (iv)  (iii)
4. (i)    (ii)   (iii)  (iv)

Subtopic:  Spontaneity & Entropy | Gibbs Energy Change |
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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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Entropy change in surroundings when 1.00 mol of ${H}_{2}{O}_{\left(l\right)}$ is formed under standard conditions.  is

Subtopic:  Spontaneity & Entropy |
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The equilibrium constant for a reaction is 10. The value of $∆\mathrm{G}°$ will be-

()

Subtopic:  Gibbs Energy Change |
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For the reaction ;  , the value of $∆\mathrm{G}°$ for the given reaction would be-

1. 1.6 J

2. - 0.16 KJ

3. 0.16 KJ

4. 1.6 KJ

Subtopic:  Gibbs Energy Change |
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