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 |
 82%
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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 |
 92%
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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 |
 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 |
 58%
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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 into the water at 273 K. The entropies of H2O(s) and H2O(l) are 38.20 and 60.01 J mol-1K-1 respectively. The enthalpy change for the conversion is:

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 |
 87%
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