Assertion :When $H_{2} S$ gas is passed into an aqueous solution of $Z n C l_{2}, Z n^{2 +}$ ions are completely precipitated as zinc sulphide. Reason: Zinc sulphide is insoluble in solutions of caustic alkali but dissolves in dilute $H C I$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is incorrect but Reason is correct

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Both Assertion and Reason are correct

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Solution

The correct option is D Both Assertion and Reason are correct
When $H_{2} S$ gas is passed into an aqueous solution of $Z n C l_{2}$ , $Z n^{2 +}$ ions are completely precipitated forming white precipitate of zinc sulphide.
$Z n C l_{2} + H C l \to Z n S ↓ (white ppt) + 2 H C l$
Zinc sulphide is insoluble in solutions of caustic soda giving white precipitate of zinc hydroxide but on heating with excess of caustic soda sodium zincate is formed.
$Z n C l_{2} + 2 N a O H \to Z n (O H)_{2}) ↓ (white ppt) + 2 N a C l$
$Z n (O H)_{2} + 2 N a O H \to N a_{2} Z n O_{2} + 2 H_{2} O$
Zinc sulphide dissolves in dilute hydrochloric acid forming zinc chloride.
$Z n S + 2 H C l \to Z n C l_{2} + H_{2} S$

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