Question

To a solution of a substance, gradual addition of ammonium hydroxide results in a brownish black precipitate which does not dissolve in excess of `NH_(4)OH`.However, when `Kl` (not in excess) is added to the original solution, a green precipitate is formed. The solution contained :
A. Lead salt
B. Silver salt
C. Mercurous salt
D. Copper salt.

Answer 1

Correct Answer - C

`Hg_(2)^(2+) + 2l^(-) to Hg_(2)l_(2)darr` (green)