Assertion :Nickel is purified by reacting it with $C O$ . Reason: Impurities present, form a volatile complex.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Nickel is purified by Mond's process.
Nickel forms a volatile complex with $C O$ nickel tetra carbonyl which can be easily decomposable. So, that we can recover nickel easily.
$N i + 4 C O 330 - 350 K ⟶ N i (C O)_{4}$
$N i (C O)_{4} 450 - 470 K ⟶ N i + 4 C O$

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