Which of the following has `DeltaS^(@)` greater than zero

Options

A. `CaO(s)+CO_(2)(g)hArrCaCO_(3)(s)`
B. `NaCl(aq.)hArrNaCl(s)`
C. `NaNO_(3)(s)hArrNa^(+)(aq.)+NO_(3)^(-0(aq.)`
D. `N_(2)(g)+3H_(2)(g)hArr 2NH_(3)(g)`

Answer

C

Explanation

When an ionic solid crystal dissolves in water, the highly ordered structure of the solid and part of the ordered structure of water are destroyed. Consequently, the solution prossesses greater disorder than the pure solute and pure solvent.