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(D) Nessler's reagent is an alkaline solution of potassium tetraiodomercurate$(II)$,$K_2[HgI_4]$.When ammonia $(NH_3)$ is added to Nessler's reagent,i

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Nessler's reagent

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(D) Nessler's reagent is an alkaline solution of potassium tetraiodomercurate$(II)$,$K_2[HgI_4]$.When ammonia $(NH_3)$ is added to Nessler's reagent,it forms a brown precipitate known as the iodide of Millon's base.The chemical reaction is: $2K_2[HgI_4] + NH_3 + 3KOH \rightarrow HgO \cdot Hg(NH_2)I + 7KI + 2H_2O$.The brown precipitate is $HgO \cdot Hg(NH_2)I$.

Which of the following reagents reacts with ammonia to form a brown precipitate?

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