A) \[Ca\,(s)+\frac{1}{2}{{O}_{2}}(g)\xrightarrow{{}}CaO\,(s)\]
B) \[C\,(g)+{{O}_{2}}(g)\xrightarrow{{}}{{O}_{2}}\left( g \right)\]
C) \[{{N}_{2}}\,(g)+{{O}_{2}}(g)\xrightarrow{{}}2N{{O}_{2}}(g)\]
D) \[CaC{{O}_{3}}\,(s)\xrightarrow{{}}CaO\,(s)+C{{O}_{2}}(g)\]
Correct Answer: D
Solution :
Entropy increases when solid changes to liquid or liquid changes to vapours. In gaseous reaction it increases when number of moles of products is greater than reactants. In \[CaC{{O}_{3}}(s)\xrightarrow{{}}CaCO(s)+C{{O}_{2}}(g);\], solid changes to gas hence its entropy increases maximum.
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