At 27ºC latent heat of fusion of a compound is 2930 J/mol. Entropy change is:
1. 9.77 J/mol K
2. 10.77 J/mol K
3. 9.07 J/mol K
4. 0.977 J/mol K
Unit of entropy is:
1. JK–1 mol–1
2. J mol–1
3. J–1K–1 mol–1
4. JK mol–1
2 mole of an ideal gas at 27ºC temp. is expanded reversibly from 2 lit. to 20 lit. Find entropy change (R = 2 cal/mol K):
1. 92.1
2. 0
3. 4
4. 9.2
What is the entropy change (in JK–1 mol–1) when one mole of ice is converted into water at 0 ºC? (The enthalpy change for the conversion of ice to liquid water is 6.0 KJ mol–1 at 0 ºC)
1. | 20.13 | 2. | 2.013 |
3. | 2.198 | 4. | 21.98 |
Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is:
1.
2.
3.
4.
A reaction occurs spontaneously if:
1. T∆S > ∆H and ∆H is +ve and ∆S are –ve
2. T∆S = ∆H and both ∆H and ∆S are +ve
3. T∆S < ∆H and both ∆H and ∆S are +ve
4. T∆S > ∆H and both ∆H and ∆S are +ve
Which of the following pairs of chemical reactions is certain to result in a spontaneous reaction:
1. Endothermic and decreasing disorder
2. Exothermic and increasing disorder
3. Endothermic and increasing disorder
4. Exothermic and decreasing disorder