The tendency of a system to acquire a state of maximum randomness is the sole criterion for the spontaneity of a process. Comment.
No, there is a natural tendency of a system to attain a state of the greater randomness i.e. more disordered state. For example,
(i) There is more randomness on mixing of two gases (which do not react chemically).
(ii) Evaporation of water. The evaporation of water results in increase of randomness because the molecules in the vapour state have more randomness than in the liquid state
(iii) Dissolution of ammonium chloride in water. Solid ammonium chloride has less randomness while in solution ammonium chloride particles move freely as 
and hence randomness increases.
If the randomness factor were the only criterion, then the process like liquefaction of gas or solidification of a liquid would not have been feasible since these were accompanied by a decrease in randomness. Hence the tendency of a system to acquire a state of maximum randomness is not the sole criterion for determining the spontaneity of the process.
