# If for a certain reaction ${∆}_{r}H$ is 30 kJ mol–1 at 450 K, the value of ${∆}_{r}S$ (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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At standard conditions, if the change in the enthalpy for the following reaction is -109 kJ mol-1

H2(g)+Br2(g) $\to$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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Which one among the following is the correct option for right relationship between Cp and CV for one mole of an ideal gas ?

1. ${\mathrm{C}}_{\mathrm{P}}={\mathrm{RC}}_{\mathrm{V}}$

2. ${\mathrm{C}}_{\mathrm{V}}={\mathrm{RC}}_{\mathrm{P}}$

3. ${\mathrm{C}}_{\mathrm{P}}+{\mathrm{C}}_{\mathrm{V}}=\mathrm{R}$

4. ${C}_{\mathrm{P}}-{\mathrm{C}}_{\mathrm{V}}=\mathrm{R}$

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

1.

2.

3.

4.

Subtopic:  Spontaneity & Entropy |
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1.

2.

3.

4.

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

1.

2.

3.

4.

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 ${∆}_{r}{G}^{⊝}$ 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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