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Topic: Second law, entropy and spontaneity· Chemical Thermodynamics

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. 2NaHCO_3(s) → Na_2CO_3(s) + CO_2(g) + H_2O_(g)D. Cl_2(g) → 2Cl_(g)Choose the correct answer from…

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. \(2NaHCO_{3(s)} \rightarrow Na_2CO_{3(s)} + CO_{2(g)} + H_2O_{(g)}\)

D. \(Cl_{2(g)} \rightarrow 2Cl_{(g)}\)

Choose the correct answer from the options given below:

1. C and D

2. A and C

3. A, B and D

4. A, C and D

1 answer

Best answer

Answer: 4. A, C and D

Key idea: entropy rises with disorder, i.e. when more gas or more particles are formed.

  • A: liquid to vapour, disorder increases, so \(\Delta S>0\).
  • B: cooling a solid to 0 K reduces disorder, so \(\Delta S<0\).
  • C: solid gives two moles of gases, \(\Delta S>0\).
  • D: 1 mol gas gives 2 mol gas, \(\Delta S>0\).

A, C and D: option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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