# For which of the following process, $\Delta S_{total} \: is\: < 0$,

$\begin {array} {1 1} (A)\;\text{ Intermixing of gases} \\ (B)\;\text{Melting of ice below$-4^{\circ}C$at$1\: atm$pressure} \\ (C)\;\text{Evaporation of water above} 100^{\circ}C \\ (D)\;\text{Burning of hydrogen in oxygen} \end {array}$

Melting of ice below $-4^{\circ}C$ is non-spontaneous, so $\Delta S_{total} < 0$
Ans : (B)