Which one of the following involves decrease in entropy?
- $2 \mathrm{NaHCO}_{3(s)} \longrightarrow \mathrm{Na}_2 \mathrm{CO}_{3(s)}+\mathrm{CO}_{2(g)}+\mathrm{H}_2 \mathrm{O}_{(g)}$
- $\mathrm{CCl}_{4(s)} \longrightarrow \mathrm{CCl}_{4(l)}$
- $\mathrm{Zn}_{(s)}+2 \mathrm{HCl}_{(a q)} \longrightarrow \mathrm{ZnCl}_{2(a q)}+\mathrm{H}_{2(g)}$
- $\begin{aligned} & \mathrm{CaO}_{(s)}+\mathrm{CO}_{2(g)} \longrightarrow \mathrm{CaCO}_{3(s)} \end{aligned}$
Solution
Asked in: AP EAMCET 2017 (26 Apr Shift 2)