In which of the following processes entropy increases? A. A liquid evaporates to vapour. B. Temperature of a crystalline solid lowered from 130 K to 0 K . C. 2 NaHCO 3( s ) rightarrow Na 2 CO 3( s ) + CO 2( g ) + H 2 O ( g ) D. Cl 2( g ) rightarrow 2 Cl ( g ) Choose the correct answer from the options given below:

Chemistry · Thermodynamics & Thermochemistry

NEET (UG) 2024 — Question 81

In which of the following processes entropy increases?

A. A liquid evaporates to vapour.

B. Temperature of a crystalline solid lowered from 130 K to 0 K .

C. $2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_{2} \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}$

D. $\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}$

Choose the correct answer from the options given below:

Option A:
A and C
Option B:
A, B and D
Option C:
A, C and D
Correct
Option D:
C and D

Answer: C

Step-by-step solution

When a liquid evaporates to vapour entropy increases.

$2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_{2} \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}$

Number of gaseous product molecules increases so entropy increases.

$\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}$

1 mole $\mathrm{Cl}_{2(\mathrm{~g})}$ form $2 \mathrm{~mol} \mathrm{Cl}_{(\mathrm{g})}$ . So entropy increases.

Answer key and solution verified before publishing.

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Exam: NEET (UG) 2024
Paper: 2024 paper
Subject: Chemistry
Chapter: Thermodynamics & Thermochemistry
Topic: Entropy Change in Different Processes

Answer: C

Step-by-step solution

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