At standard conditions, if the change in the enthalpy for the following reaction is -109 kJ mol-1

H2(g)+Br2(g) 2HBr(g)

and the bond energy of H2 and Br2 is 435 kJ mol-1 and 192 kJ mol-1, respectively, what is the bond energy (in kJ mol-1) of HBr?

1. 368

2. 736

3. 518

4. 259

Subtopic:  Thermochemistry |
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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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Which one among the following is the correct option for right relationship between Cp and CV for one mole of an ideal gas ?

1. CP=RCV

2. CV=RCP

3. CP+CV=R

4. CPCV=R

Subtopic:  Cp & Cv |
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For irreversible expansion of an ideal gas under isothermal condition, the correct option is :

1. U=0, Stotal0

2. U0, Stotal=0

3. U=0, Stotal=0

4. U0, Stotal0

Subtopic:  Spontaneity & Entropy |
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The correct option for free expansion of an ideal gas under adiabatic condition is:

1.  q=0, T<0 and w>0

2.  q<0, T=0 and w=0

3.  q>0, T>0 and w>0

4.  q=0, T=0 and w=0

Subtopic:  2nd & 3rd Law of Thermodynamics |
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For the reaction, 2Cl(g)  Cl2(g), the correct option is:

1. rH>0 and rS<0

2. rH<0 and rS>0

3. rH<0 and rS<0

4. rH>0 and rS>0

Subtopic:  Enthalpy & Internal energy | Spontaneity & Entropy |
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Hydrolysis of sucrose is given by the following reaction

Sucrose + H2 Glucose + Fructose

If the equilibrium constant (Kc) is 2×1013 at 300 K, the value of rG at the same temperature will be:

1. 8.314 J mol-1 K-1×300 K×ln (2×1013)

2. 8.314 J mol-1 K-1×300 K×ln (3×1013)

3. -8.314 J mol-1 K-1×300 K×ln (4×1013)

4. -8.314 J mol-1 K-1×300 K×ln (2×1013)

Subtopic:  Gibbs Energy Change |
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Which of the following p-V curve represents the maximum work done?
 
1. 2.
3. 4.
Subtopic:  2nd & 3rd Law of Thermodynamics |
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The work done when 1 mole of gas expands reversibly and isothermally from pressure of 5 atm to 1 atm at 300 K is

(Given log 5=0.6989 and R=8.314 J K-1 mol-1)
1.  zero J
2.  150 J
3.  +4014.6 J
4.  -4014.6 J

Subtopic:  First Law of Thermodynamics |
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One mole of an ideal gas at 300 K is expanded isothermally from 1 L to 10 L volume. \(\Delta U\) for this process is:
(Use R = 8.314 J K–1 mol–1)
1. 1260 J
2. 2520 J
3. 5040 J
4. 0 J
Subtopic:  First Law of Thermodynamics |
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