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ASSERTION: In the extraction of Ag, complex \( \mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN})_{2}\right] \) is reacted with Zn. REASON: Zn is a d-block transition metal.

1. If both assertion and reason are CORRECT, and reason is the CORRECT explanation of the assertion
2. If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion
3. If assertion is CORRECT but reason is INCORRECT
4. If assertion is INCORRECT but reason is CORRECT

Correct answer: If assertion is CORRECT but reason is INCORRECT

Solution

The assertion is correct: zinc displaces silver from the dicyanoargentate complex, releasing Ag. The reason is incorrect because zinc is not a d-block transition metal in the strict sense; it has a filled d-subshell in its common state and does not fit the usual transition-metal definition.

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