Change in entropy is negative for

Options

A. Bromine`(l)to`Bromine`(g)`
B. `C(s)+H_(2)O(g)toCO(g)+H_(g)`
C. `N_(2)(g,10 atm)N_(2)(g,1 atm)`
D. `Fe(1 mol e,400 K)toFe(1 mol e,300 K)`

Answer

D

Explanation

The gaseous phase have more entropy and thus `DeltaS` is +ve in (a) and (b). Alos decrease in pressure increase disorder and thus `DeltaS` is `+ve` in (c). In (d)the disorder decrease in solid state due to decrease in temperature. Thus `DeltaS=-ve`