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To a solution of a substance, the gradual addition of ammonium hydroxide results in a brownish-black precipitate that does not dissolve in excess of ${NH}_{4} OH$ . However, when KI (not in excess) is added to the original solution, a green precipitate is formed. The solution contained

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silver salt

lead salt

copper salt

mercurous salt

answer is C.

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Detailed Solution

When mercurous salt treated with amonium hydroxide, results in black ppt. further, when it is added to KI, it gives green precipitate (ppt.)

${Hg}_{2}^{2 +} \overset{{NH}_{4} OH}{\to} \frac{Hg + HgO \cdot Hg ({NH}_{2}) {NO}_{3} ↓}{Black} ↓ {Hg}_{2} I_{2} ↓ (Green ppt .)$

The correct option is C.

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