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A black sulphide is formed by the action of \mathrm{H}_{2} \mathrm{S} on

Option: 1

Cupric chloride


Option: 2

Cadmium chloride


Option: 3

Zinc chloride


Option: 4

Sodium chloride


Answers (1)

As we have learnt, 

\text{CuS } is the only black sulphide which can be precipitated upon reaction of  Cupric chloride with \mathrm{H_2S }

\mathrm{CuCl}_{2}+\mathrm{H}_{2} \mathrm{~S} \rightarrow \underset{(\text { Black ppt })}{\mathrm{CuS}}+2 \mathrm{HCl}

\mathrm{CdS } is yellow while \mathrm{ZnS } is white.

Hence, the correct answer is Option (1)

Posted by

Sumit Saini

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