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

C u C l_{2}

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C d C l_{2}

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Z n C l_{2}

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N a C l

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Solution

The correct option is A $C u C l_{2}$
Option (A) is correct.
A black sulphide is formed by the action of $H_{2} S$ on $C u C l_{2}$ .
$\begin{matrix} C u C l_{2} & + & H_{2} S & ⟶ & C u S & + & 2 H C l (B l a c k) \end{matrix}$
$C d C l_{2}$ forms yellow ppt and $Z n C l_{2}$ forms white ppt.

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