In which of the following processes does the entropy of the system decrease?

AMelting of ice
BSublimation of naphthalene
CEvaporation of water
DCondensation of steam to water

Answer: D

Entropy increases with disorder: solid to liquid, liquid to gas and solid to gas all raise it. Condensation of steam to liquid water makes the system more ordered, so

Δ S_{sys} < 0

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