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In Which one of the following, $Δ S^{\circ}$ greater than zero?

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$CaO (s) + {CO}_{2} (g) ⇌ {CaCO}_{3} (s)$

${NaNO}_{3} (s) ⇌ {Na}^{+} (a q) + {NO}_{3}^{-} (a q)$

$N_{2} (g) + 3 H_{2} (g) ⇌ 2 {NH}_{3} (g)$

$\underset{(g)}{2 {SO}_{2}} + \underset{(g)}{O_{2}} ⇌ \underset{(g)}{2 S O_{3}}$

answer is C.

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Detailed Solution

${NaNO}_{3} ⇌ {Na}^{+} (a q) + {NO}_{3}^{-} (a q)$

$∆ S^{°}$ is positive as only in this process entropy of the system increases.

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