Correct Answer: Option A

Explanation

Entropy is the measure of the degree of disorderliness or randomness in a system. It will, however, decrease from gaseous to liquid and to solid states and vice versa.

This implies for option A, as you move from reactants(liquid H\(_2\)O) to products(gaseous H\(_2\)O), entropy increases because the level of disorderliness increases. (Just liken it to liquid water that needs to be boiled). Hence ΔS = + ve.

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