If for a certain reaction rH is 30 kJ mol–1 at 450 K, the value of rS (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 knownFe2O3(s)+3CO(g)2Fe(s)+3CO2(g);H=-26.88 kJFeO(s)+CO(g)Fe(s)+CO2(g);H=-16.5 kJ

The value of H for the following reaction

Fe2O3(s)+CO(g)2FeO(s)+CO2(g) 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 > HS                       (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 H2Ol is formed under standard conditions. fHθ=-286 kJ mol-1 is

1. -959.73 J K-1 mol-12. 234.98 J K-1 mol-13. 959.73 J K-1 mol-14. 312.56 J K-1 mol-1

Subtopic:  Spontaneity & Entropy |
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The equilibrium constant for a reaction is 10. The value of G° will be-

(R = 8.314 J K-1 mol-1 ; T = 300 K)

1. -5.74 kJ mol-12. - 5.74 J mol-13. + 4.57 kJ mol-14. -57.4 kJ mol-1

Subtopic:  Gibbs Energy Change |
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For the reaction 2A (g) + B(g)  2D (g); U° = -10.5 kJ and S° = -44.1 J K-1 , the value of 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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