A white crystalline substance dissolves in water.On passing `H_(2)S` in this solution, a black
Channel: Doubtnut
Date: 2020-01-26

A white crystalline substance dissolves in water.On passing `H_(2)S` in this solution, a black precipitate is obtained.The black precipitate dissolves completely in hot `HNO_(3)`.On adding a few drops of concentrated `H_(2)SO_(4)`, a white precipitate is obtained.This precipitate is that of