In which of the following processes entropy increases? \ A. A liquid evaporates to vapour. \ B. Te

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. $2 \mathrm{NaHCO}_{3(s)} ightarrow \mathrm{Na}_2 \mathrm{CO}_{3(s)}+\mathrm{CO}_{2(g)}+\mathrm{H}_2 \mathrm{O}_{(g)}$ \ D. $\mathrm{Cl}_{2(g)} ightarrow 2 \mathrm{Cl}_{(g)}$ \ Choose the correct answer from the options given below:

Professor PC Thomas Classes · Answer

(c) : A. Molecules in gaseous phase have greater freedom of movement, i.e., have greater randomness than those in liquid phase, hence entropy increases. B. On decreasing temperature of a solid, entropy decreases. C. As number of gaseous products increases, randomness increases. D. The products have larger number of gaseous particles, hence entropy increases.