Question

The change in entropy ( $\Delta S^{o}$ ) will be highest for the which of the following reactions?

• A. $Ca\left(s\right)+\frac{1}{2}O_{2}\left(g\right) \rightarrow CaO\left(s\right)$
• B. $CaCO_{3}\left(s\right) \rightarrow CaO\left(s\right)+CO_{2}\left(g\right)$
• C. $C\left(g\right)+O_{2}\left(g\right) \rightarrow CO_{2}\left(g\right)$
• D. $N_{2}\left(g\right)+O_{2}\left(\right.g\left.\right) \rightarrow 2NO\left(\right.g\left.\right)$

Answer 1

Answer: (B)

Eq.(b) shows largest phase change $ie$ ,gas $→$ solid