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Explain the role of carbon monoxide in the purification of nickel?

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Explain the role of carbon monoxide in the purification of nickel?

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During the purification of Nickel by Mond’s process, carbon monoxide (CO) is used to convert impure nickel to nickel carbonyl. Nickel carbonyl is an unstable compound. Heating to higher temperature decomposes it to give pure nickel.

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