Which of the following Group I cations forms a white chloride precipitate with dilute , which uniquely undergoes a disproportionation reaction to turn completely black upon the addition of aqueous amm

Question

Which of the following Group I cations forms a white chloride precipitate with dilute $HCl$, which uniquely undergoes a disproportionation reaction to turn completely black upon the addition of aqueous ammonia?

Prashant Kotian · Accepted Answer

Correct answer: C. (calomel) is a white precipitate. When treated with , it undergoes disproportionation to form finely divided elemental mercury (, black) and mercury(II) amidochloride (, white). The overall mixture appears black.

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