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The process which is non spontaneous at all temperature is

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Decomposition of $P C l_{5} (g)$

Formation of $O_{3} (g) from O_{2} (g)$

Formation of $N H_{3} (g)$ from $N_{2} (g)$ and $H_{2} (g)$

Sublimation of $C O_{2} (s)$

answer is B.

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Detailed Solution

$3 O_{2} (g) \to 2 O_{3} (g) \begin{array}{l} Δ H = + (v e) \\ Δ S = - (v e) \end{array}$

As $Δ H = + v e, a n d Δ S = - v e$
Which makes $Δ G$ always (+) ve Irrespective of temperature.

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