Assertion : $A g {N O}_{3}$ reacts with $K C N$ to form white ppt. of $A g C N$ . This white ppt. disappears when excess $K C N$ is added. Reason: $A g C N$ decomposes to form siver-carbide and evovle $N_{2}$ gas.

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 correct but Reason is incorrect

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Assertion is correct but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Silver nitrate reacts with KCN to form a white precipitate of silver cyanide. In excess KCN, this white precipitate dissolves to form potassium argentocyanide.
$A g N O_{3} + K C N \to A g C N + K N O_{2}$
$A g C N + K C N \to K A g (C N)_{2}$

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