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 |
 61%
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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 |
 66%
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The mathematical form of the first law of thermodynamics when heat (q) is supplied and W is work done by the system (-ve) is:

1. U=q+W                       

2. U=q-W

3. U=-q+W                       

4. U= -q-W

Subtopic:  2nd & 3rd Law of Thermodynamics |
 59%
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Which statements are correct?

1. 2.303 logP2P1=Hvap.RT2-T1T1T2 is called Clausius-Clapeyron equation

2. Hvap.Boiling Point=88 J mol-1K-1 is called Trouton's rule

3. Entropy is a measure of unavailable energy, i.e.,

     unavailable energy = entropy x temperature

4. All of the above

 

Subtopic:  Enthalpy & Internal energy |
 80%
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S° will be highest for the reaction:

1. Ca(s) + 1/2 O2(g) CaO(s)

2. CaCO3(s)CaO(s) + CO2(g)

3. C(s) + O2(g)CO2(g)

4. N2(g) + O2(g)2NO(g)

Subtopic:  Spontaneity & Entropy |
 71%
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One mole of ice is converted to water at 273 K. The entropies of H₂O(s) and H₂O(l) are 38.20 J mol⁻¹K⁻¹ and 60.01 J mol⁻¹K⁻¹, respectively. What is the enthalpy change for this conversion?

1. 59.54 J mol-1                               

2. 5954 J mol-1

3. 595.4 J mol-1                             

4. 320.6 J mol-1

Subtopic:  Spontaneity & Entropy |
 73%
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A gaseous system changes from state A(P1, V1, T1) to B(P2,V2,T2), B to C(P3, V3, T3) and finally from C to A. The whole process may be called:

1. reversible process                           

2. cyclic process

3. isobaric process                               

4. spontaneous process

Subtopic:  Thermodynamics' Properties and process |
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When one mole of monoatomic ideal gas at TK undergoes reversible adiabatic change under a constant external pressure of 1 atm changes volume from 1 litre to 2 litre. The final temperature in kelvin would be:

1. T/(2)2/3                                         

2. T + 2/(3x0.0821)

3. T                                                   

4. T - 3/(2x0.0821)

Subtopic:  Cp & Cv |
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Which is not a spontaneous process?

1. Expansion of gas into the vacuum

2. Water flowing downhill

3. Heat flowing from a colder body to a hotter body

4. Evaporation of water from clothes during drying

Subtopic:  Spontaneity & Entropy |
 73%
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All the naturally occurring processes, i.e., spontaneous proceed spontaneously in a direction that leads to:

1. decrease of free energy                     

2. increase of free energy

3. decrease of entropy                           

4. increase of enthalpy

Subtopic:  Spontaneity & Entropy |
 65%
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