For which reaction from the following will be maximum entropy change:

C a (s) + \frac{1}{2} O_{2} (g) \to C a O

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C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

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C (s) + O_{2} (g) \to C O_{2} (g)

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N_{2} (g) + O_{2} (g) \to 2 N O

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Solution

The correct option is B $C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$
(A) $C a (s) + \frac{1}{2} O_{2} (g) \to C a O (s)$ $△ H_{g} = - \frac{1}{2}$
(B) $C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$ $△ n_{g} = 1$
(C) $C (s) + O_{2} (g) \to C O_{2} (g)$ $△ n_{g} = 1 - 1 = 0$
(D) $N_{2} (g) + O_{2} (g) \to 2 N O (g)$ $△ n_{g} = 2 - 1 - 1 = 0$
Maximum Entropy for (B)

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