In which can change in entropy is negative

Options

A. Evaporation of water
B. Expansion of a gas at constant temperature
C. Sublimation of solid to gas
D. `2H(g) to H_(2)(g)`

Answer

D

Explanation

(a) For evaporation of water `DeltaS gt 0, Delta S = +ve`
(b) In expansion of gas at constant T
`DeltaS gt 0, Delta S =+ve`
(c) `S to g`
`DeltaS= +ve`
`2H(g) to H_(2)(g), DeltaS lt 0( :. Deltan_(l) lt 0)`
No. of particle decrease from reactant to product side.