Question

A black sulphide is formed by the action of `H_(2)S` on:
A. cupric chloride
B. cadmium chloride
C. zinc chloride
D. ferric chloride

Answer 1

Correct Answer - A
(A)`Cu^(2+) + S^(2-) to CuS darr`(black),
(B)`Cd^(2) + S^(2-) to CdS darr` (yellow)
( C)`Zn^(2+)+S^(2-) to ZnS darr` (white)
(D)`2Fe^(3+) + H_(2)S to 2Fe^(2+)+2H^(+) +S darr`(milky white)