Assertion :In the extraction of $A g$ , complex $N a [A g (C N)_{2}]$ is reacted with $Z n$ . Reason: $Z n$ is d-block transition metal.

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 incorrect and Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Treatment of the cyanide compound of silver with zinc gives displacement reaction in which silver is obtained.
$2 [A g (C N)_{2}]^{-} + Z n \to [Z n (C N)_{4}]^{2 -} + 2 A g ↓ .$
This displacement is possible because zinc is more active than silver.
Zn is d-block metal but not transition metal.

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