PRACTICAL CHEMISTRY
37333
\({H_2}S\) will precipitate the sulphides of all the metals from the solution of chlorides of \(Cu,Zn\) and \(Cd,\) if
1 The solution is aqueous
2 The solution is acidic
3 The solution is dilute acidic
4 Any of these solutions is present
Explanation:
(c)Due to common ion effect as
\(HCl\; \to \;{H^ + }\; + \;C{l^ - }\);
\({H_2}S\; \to \;2\;{H^ + } + \;{S^{2 - }}\).