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\mathrm{H}_{2} \mathrm{S} will precipitate the sulphides of all the metals from the solution of chlorides of \mathrm{Cu^{2+}}, \mathrm{Zn^{2+}} and \mathrm{Cd^{2+}} if

Option: 1

The solution is aqueous


Option: 2

The solution is acidic


Option: 3

The solution is basic


Option: 4

Any of these solutions is present


Answers (1)

best_answer

As we have learnt, 

\mathrm{Cu^{2+}} and \mathrm{Cd^{2+}} belong to Group II while \mathrm{Zn^{2+}} belongs to Group IV.

Basic radicals of Group IV require \mathrm{H_2S} in alkaline medium for their precipitation as the sulphide.

Hence, the correct answer is Option (3)

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vinayak

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