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A black sulphide is formed by the action of $H_{2} S$ on:

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cupric chloride

cadmium chloride

zinc chloride

ferric chloride

answer is A.

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Detailed Solution

A black sulphide is formed by the action of $H_{2} S$ on ${CuCl}_{2}$

${CuCl}_{2} + H_{2} S \to \underset{(Black)}{CuS} + 2 HCl$

${CdCl}_{2}$ forms yellow ppt and ${ZnCl}_{2}$ forms white ppt.

A black sulphide is formed by the action of $H_{2} S$ on cupric chloride.

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