For which of the following reactions, the entropy change is positive?

H_{2} + \frac{1}{2} O_{2} \to H_{2} O

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{N a}^{+} (g) + {C l}^{-} (g) \to N a (s) C l

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N a C l (l) \to N a C l (s)

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H_{2} O (l) \to H_{2} O (g)

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Solution

The correct option is D $H_{2} O (l) \to H_{2} O (g)$
Entropy change is positive for vaporization of liquid water to water vapor.
The entropy of a compound in gaseous state is higher than the entropy of compound in liquid state.

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