Which one of the followings has \( \Delta S^{\circ} \) positive? (A) \( \mathrm{CaO}(s)+\mathrm{...

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Which one of the followings has \( \Delta S^{\circ} \) positive?
(A) \( \mathrm{CaO}(s)+\mathrm{CO}_{2}(g) \rightleftharpoons \mathrm{CaCO}_{3}(s) \)
(B) \( \mathrm{NaCl}(a q) \rightleftharpoons \mathrm{NaCl}(s) \)
(C) \( \mathrm{NaNO}_{3}(s)+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{Na}^{+}(a q)+\mathrm{NO}_{3}^{-}(a q) \)
(D) \( \mathrm{N}_{2}(g)+3 \mathrm{H}_{2}(g) \rightleftharpoons 2 \mathrm{NH}_{3}(g) \)
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