The process with negative entropy change is

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(D) Entropy change $(\Delta S)$ is related to the change in the number of moles of gaseous species. $A$ decrease in the number of gaseous moles leads

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Synthesis of ammonia from $N_2$ and $H_2$

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(D) Entropy change $(\Delta S)$ is related to the change in the number of moles of gaseous species. $A$ decrease in the number of gaseous moles leads to a negative entropy change.$A$: $CaSO_{4(s)} 	o CaO_{(s)} + SO_{3(g)}$ (Number of gaseous moles increases from $0$ to $1$,$\Delta S > 0$)$B$: $CO_{2(s)} 	o CO_{2(g)}$ (Solid to gas transition,$\Delta S > 0$)$C$: $I_{2(s)} 	o I_{2(aq)}$ (Solid to aqueous transition,$\Delta S > 0$)$D$: $N_{2(g)} + 3H_{2(g)} 	o 2NH_{3(g)}$ (Number of gaseous moles decreases from $4$ to $2$,$\Delta S Therefore,the synthesis of ammonia results in a decrease in entropy.

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