In which of the following two processes, the change in entropy of the system will be negative? (1) Fusion of ice. (2) Condensation of water vapour.

Explanation

The change in entropy of the system is negative during condensation of water vapour. In this process, `DeltaS_(sys)=S_("water")-S_("water vapour")lt0`.
As the molecules in water vapour have more freedom of motion than they have I water, the molecular randomness is more in water vapour than in water, the molecular randomness is more in water vapour than in water. thus, `S_("water") lt S_("water vapour")`. consequently, the value of `DeltaS` becomes negative.