The entropy change in the fusion of one mole of a solid melting at 27°C  is  -       

(the latent heat of fusion is 2930 J mol-1)                                                                                   

1. 9.77 JK-1mol-1               

2. 19.73 JK-1mol-1               

3. 2930 JK-1mol-1               

4. 108.5 JK-1mol-1          

Subtopic:  Spontaneity & Entropy |
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The maximum work done in expanding 16 g oxygen at 300 K and occupying a volume of 5 dm3 isothermally until the volume becomes 25 dm3 is:

1. 2.01 x 103 J                       

2. +2.81 x 103 J

3. 2.01 x 10-3 J                     

4. +2.01 x 10-6 J

Subtopic:  2nd & 3rd Law of Thermodynamics |
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1 mole of an ideal gas at 25°C is subjected to expand reversibly ten times of its initial volume. The change in entropy of expansion is:

1. 19.15 JK-1mol-1                         

2. 16.15 JK-1mol-1

3. 22.15 JK-1mol-1                         

4. None of the above

Subtopic:  Spontaneity & Entropy |
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For the process

H2O(l) H2O(g)

 at T=100°C and 1 atmosphere pressure, the correct choice is:

1. Ssystem>0 and Ssurrounding>0

2. Ssystem>0 and Ssurrounding<0

3. Ssystem<0 and Ssurrounding>0

4. Ssystem<0 and Ssurrounding<0

Subtopic:  Spontaneity & Entropy |
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 During an adiabatic process:

1. pressure is maintained constant

2. gas is isothermally expanded

3. there is perfect heat insulation

4. the system changes heat with surroundings

Subtopic:  2nd & 3rd Law of Thermodynamics |
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Heat of combustion H° for C(s), H2(g) and CH4(g) are -94, -68 and -213 kcal/mol. Then, H° for 

C(s) + 2H2(g) CH4(g) is                                                                 

1. -17 kcal/mol                         

2. -111 kcal/mol

3. -170 kcal/mol                       

4. -85 kcal/mol

Subtopic:  Thermochemistry |
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If 50 calorie are added to a system and system does work of 30 calorie on surroundings, the change in internal energy of system is:

1. 20 cal                             

2. 50 cal

3. 40 cal                             

4. 30 cal

Subtopic:  Enthalpy & Internal energy |
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For the process:

H2O(l)[1 bar, 373 K] H2O(g)[1 bar, 373 K] the correct set of thermodynamic parameters are:

1. G=0; S=+ve

2. G=0; S=-ve

3. G=+ve; S=0

4. G=-ve; S=+ve

Subtopic:  Spontaneity & Entropy |
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The internal energy change when a system goes from state A to B is 40 kJ/mol. If the system goes from A to B by a reversible path and returns to state A by an irreversible path. What would be the change in internal energy?

1. 40 kJ                                   

2. >40 kJ

3. <40 kJ                                 

4. Zero

Subtopic:  2nd & 3rd Law of Thermodynamics |
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Change in entropy is negative for:

1. Bromine (l)Bromine(g)

2. C(s) + H2O(g) CO(g) + H2(g)

3. N2(g,10 atm)N2(g,1 atm) 

4. Fe ( 1mol, 400 K)  Fe( 1mol, 300 K)

Subtopic:  Spontaneity & Entropy |
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