During the qualitative analysis of a mixture containing `Cu^(2+)` and `Zn^(2+)` ions. `H_2S` gas is passed through an ac

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Q 2627256181.     During the qualitative analysis of a mixture containing `Cu^(2+)` and `Zn^(2+)` ions. `H_2S` gas is passed through an acidified solution containing these ions in order to test `Cu^(2+)` alone. Explain briefly .
JEE 1998

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