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CBSE

Subject

Chemistry

NEET Chemistry : Thermodynamics

Multiple Choice Questions

121.

For the reaction, X₂Y₄ (l) → 2XY₂ (g) at 300 K, the values of $∆$ U and $∆$ S are 2 kcal and 20 cal K^-1 respectively. The value of $∆$ G for the reaction is

-3400 cal
3400 cal
-2800 cal
2000 cal

122.

Given that

$C + O_{2} \to {CO}_{2}; ∆ H^{°} = - a kJ . 2 CO + O_{2} \to 2 {CO}_{2}; ∆ H^{°} = - b kJ .$

The heat of formation of CO is

$b - 2 a$
$\frac{2 a - b}{2}$
$\frac{b - 2 a}{2}$
2a-b

123.

Which of the following is always feasible?

$∆ H = T ∆ S$
$∆ H (+ ve), T ∆ S (- ve) and ∆ H > T ∆ S$
$∆ H (- ve), T ∆ S (+ ve) and ∆ H < T ∆ S$
$∆ H (- ve), T ∆ S (- ve) and ∆ H > T ∆ S .$

124.

Assertion : The increase in internal energy ( $∆$ E) for the vapourization of one mole of water at 1 atm and 373 K is zero.

Reason : For all isothermal processes, $∆$ E = 0.

If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true and the reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

125.

The enthalpy of vaporisation of a certain liquid at its boiling point of 35°C is 24.64 kJ mol^-1. The value of change in entropy for the process is

704 JK^-1mol^-1
80 JK^-1mol^-1
24.64 JK^-1mol^-1
7.04 JK^-1mol^-1

126.

Assertion : $∆$ H and $∆$ E are almost the same for the reaction, N_2(g) + O_2(g) → 2NO_(g)

Reason : All reactants and products are gases.

If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true and the reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

127.

Assertion: Mass and volume are extensive properties.
Reason: Mass/volume is also an extensive parameter.

If both assertion and reason are true and reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.

128.

Assertion: During an adiabatic process, heat energy is not exchanged between the system and its surroundings.

Reason: The temperature of a gas increases when it undergoes an adiabatic expansion.

If both assertion and reason are true and the reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.

129.

The values of $∆ H$ and $∆ S$ of a certain reaction are -400 kJ mol^-1 and -20 kJ mol^-1K^-1 respectively. The temperature below which the reaction is spontaneous, is

100 K
20°C
20 K
120°C

130.

Assertion : BaCO₃ is more soluble in HNO₃ than in plain water.

Reason : Carbonate is a weak base and reacts with the H⁺ from the strong acid, causing the barium salt to dissociate.

If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true and the reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

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