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  • To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of <img alt="\mathrm{NH}_{4} \mathrm{OH}" src="https://entrance

To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of \mathrm{NH}_{4} \mathrm{OH}. However, when HCl is added to the original solution, a white precipitate is formed. The solution contained

Option: 1

Lead salt


Option: 2

Silver salt


Option: 3

Mercurous salt


Option: 4

Copper salt


Answers (1)

best_answer

The solution must contain Mercurous salt as it gives a disproportionation reaction with \mathrm{NH_4OH}

\mathrm{\mathrm{Hg}_{2} \mathrm{Cl}_{2}+2 \mathrm{NH}_{4} \mathrm{OH} \rightarrow \underset{Black}{\mathrm{Hg}}+\mathrm{Hg}\left(\mathrm{NH}_{2}\right) \mathrm{Cl}+\mathrm{NH}_{4} \mathrm{Cl}+2 \mathrm{H}_{2} \mathrm{O}}

\mathrm{Hg}_{2} \mathrm{Cl}_{2} is obtained as the white precipitate upon reaction of Mercurous ions with \mathrm{HCl}

Hence, the correct answer is Option (3)

Posted by

Rishabh

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