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CBSE

Subject

Chemistry

NEET Chemistry : Thermodynamics

Multiple Choice Questions

101.

The enthaply change ( $∆ H$ ) for the reaction

$N_{2 (g)} + 3 H_{2 (g)} \to 2 {NH}_{3 (g)}$

is -92.38 kJ at 298K . The internal energy change $∆ U$ at 298K is

-92.38 kJ
-87.42 kJ
-97.34 kJ
-89.9 kJ

102.

For a spontaneous process the correct statement is

entropy of the system always increases.
free energy of the system always increases.
total entropy change is always negative.
total entropy change is always positive.

103.

$∆ S_{surr}$ for an exothermic reaction is

always positive
always negative
zero
may be positive or negative

104.

Assertion : Many endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature.

Reason : Entropy of the system increases with increase in temperature.

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

105.

In exothermic reaction heat is :

given out
absorbed
not involved
given out or absorbed

106.

$∆ H_{f}^{°}$ (298 K) of methanol is given by the chemical equation

CH_{4 (g)} + $\frac{1}{2}$ O_{2 (g)}→CH₃OH_(g)
C (graphite) + $\frac{1}{2}$ O_{2 (g)} + 2H₂ → CH₃OH_(l)
C (diamond) + $\frac{1}{2}$ O₂_(g) + 2H₂_(g) → CH₃OH_(l)
CO_(g) + 2H₂ → CH₃OH_(l)

107.

A gas can expand from 100 mL to 250 mL under a constant pressure of 2 atm .The work done by gas is :

30.38 joule
25 joule
5 k joule
16 joule

108.

Distribution law was given by :

Henry
Vant Hoff
Nernst
Ostwald

109.

An endothermic reaction with high activation energy for the forward reaction is given by the diagram

110.

Assertion : As a salt such as NaCl dissolves, the Na⁺ and Cl^- ions leaving the crystal lattice acquire far greater freedom.

Reason : In thermodyanamic terms, the formation of solution occurs with a favourable change in free energy, i.e., $∆$ H has a high positive value and T $∆$ S a low negative value.

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

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