When calomel reacts with $\mathrm{NH}_{4} \mathrm{OH}$, we get\

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Professor PC Thomas Classes · Answer

(c) : When calomel reacts with $\mathrm{NH}_{4} \mathrm{OH}$, it turns black due to the formation of a mixture of mercury and ammonium basic mercury (II) chloride.\ $\mathrm{Hg}_{2} \mathrm{Cl}_{2}+2 \mathrm{NH}_{4} \mathrm{OH} \rightarrow \mathrm{NH}_{4} \mathrm{Cl}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{Hg}+\mathrm{HgNH}_{2} \mathrm{Cl}$ \(Calomel)\