In which case change in entropy is negative?
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The explanation of given statements are
Entropy is positive in case of expansion of a gas at constant temperature. It is because during expansion of gas volume increases and hence randomness increases.
Entropy is positive in case of sublimation of solid to gas as gas is much disordered than a solid.
Entropy is negative in case of 
as the number of moles of gaseous reactants are more than that of gaseous products.
Entropy is positive in case of evaporation of water as gas is much disordered than a liquid.
Hence, option is correct.
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