Thermodynamics - Live Session

Which among the following state functions is an extensive property of the system?

1.	Temperature	2.	Volume
3.	Refractive index	4.	Viscosity

Which, among the following, is not a state function?
1. Internal energy
2. Free energy
3. Work
4. Enthalpy

Which of the following is correct for isothermal expansion of an ideal gas:
1. W_rev = W_irr
2. W_rev + W_irr = 0
3. W_rev > W_irr
4. q_rev = q_irr

The heat of combustion of solid benzoic acid at constant volume is -321.30 kJ at 27^o C. The heat of combustion at constant pressure will be
1. -321.30 - 300 R
2. -321.30 + 300R
3. -321.30 - 150 R
4. -321.30 + 900 R

The hypothetical reaction, $A \to 2 B$ , proceed through following sequence of steps
$A \to C; ∆ H = q_{1}$
$C \to D; ∆ H = q_{2}$
$(1 / 2) D \to B; ∆ H = q_{3}$
The heat of reaction will be
1. $q_{1} - q_{2} + 2 q_{3}$
2. $q_{1} + q_{2} - 2 q_{3}$
3. $q_{1} + q_{2} + 2 q_{3}$
4. $q_{1} + 2 q_{2} - 2 q_{3}$

A solution of 200 mL of 1 M KOH is added to 200 mL of 1 M HCl and the mixture is well shaken. The rise in temperature T₁ is noted. The experiment is repeated by using 100 mL of each solution and increase in temperature T₂is again noted. Which of the following is correct?
1. T₁ = T₂
2. T₂ is twice as large as T₁
3. T₁ is twice as large as T₂
4. T₁ is four times as large as T₂

Given that
${CH}_{4} (g) + 360 kJ \to C (g) + 4 H (g)$
$C_{2} H_{6} (g) + 620 kJ \to 2 C (g) + 6 H (g)$
The value of C-C bond energy is
1. 260 kJ mol^-1
2. 180 kJ mol^-1
3. 130 kJ mol^-1
4. 80 kJ mol^-1

The work done on the system when one mole of an ideal gas at 500 K is compressed isothermally and reversibly to 1/10th of its original volume (R = 2 cal)
1. 500 kcal
2. 1.51 kcal
3. -23.30 kcal
4. 2.303 kcal

Given
$C (s) + O_{2} (g) \to {CO}_{2}; ∆ H = - 395 kJ$
$S (s) + O_{2} (g) \to {SO}_{2} (g); ∆ H = - 295 kJ$
${CS}_{2} (l) + 3 O_{2} (g) \to {CO}_{2} (g) + 2 {SO}_{2}; ∆ H = - 1110 kJ$
The heat of formation of CS₂(l) is
1. 125 kJ mol^-1
2. 31.25 kJ mol^-1
3. 25.6 kJ mol^-1
4. 250 kJ mol^-1

10.

Which of the following process has negative value of $∆$ S ?
1. Dissolution of sugar in water
2. Stretching of rubber band
3. Decomposition of lime stone
4. Evaporation of water

11.

A particular reaction at 27^oC for which $∆ H > 0$ and $∆ S > 0$ is found to be non-spontaneous. The reaction may proceed spontaneously
1. The temperature is decreased
2. The temperature is increased
3. The temperature is kept constant
4. It is carried in an open vessel at 27^oC

12.

For the reaction between CO₂ and graphite ${CO}_{2} (g) + C (s) \to \to 2 CO (g)$
$∆ H = + 170.0 kJ$ and $∆ S = + 170 {JK}^{- 1}$ . The reaction spontaneous at -
1. 298 K
2. 1000 K
3. 900 K
4. 1200 K

13.

Entropy of vaporisation of water 100^oC, if molar heat of vaporisation is 9710 cal mol^-1 will be
1. 20 cal mol^-1 K^-1
2. 26 cal mol^-1 K^-1
3. 24 cal mol^-1 K^-1
4. 28 cal mol^-1 K^-1

14.

For the process
${NH}_{3} (g) + HCl (g) \to {NH}_{4} Cl (s)$
1. Both $∆ H$ and $∆ S$ are +ve
2. $∆ H$ is -ve and $∆ S$ is +ve
3. $∆ H$ is +ve and $∆ S$ is -ve
4. Both $∆ H$ and $∆ S$ are -ve

15.

One mole of perfect gas expands isothermally to ten times its original volume. The change in entropy
1. 0.1 R
2. 2.303 R
3. 10.0 R
4. 100.0 R

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