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    				| 1. | Dissociation of H2S is suppressed in acidic medium.Explain | 
| Answer» Only Cu2+ and Pb2+ are precipitated as CuS and PbS respectively. These are the metal sulphides of group II. The Ks of these metal sulphides is small. Due to common ion (H+) effect, the dissociation of wealth acid H2S is suppressed. | |