Question

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. 2NaHCO3(s) -> Na2CO3(s)+CO2(g)+H2O(g)
D. Cl2(g) -> 2Cl(g)
Choose the correct answer from the options given below:

• A. A and C
• B. A, B and D
• C. A, C and D
• D. C and D

Answer 1

Answer: (C)

A, C and D

Answer 2

- A: A liquid evaporating to vapor increases entropy because gas has higher randomness.
- C: Decomposition of $NaHCO_3$ increases entropy as solid converts to gases ($CO_2, H_2O$).
- D: Dissociation of $Cl_2$ into $2Cl$ increases entropy due to an increase in the number of particles.
- B: Lowering temperature decreases entropy as randomness decreases.