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6.12 Describe a method for refining nickel.

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Nickel is refined by Mond's Process, in which Nickel is heated in steam in presence of Carbon monoxide (CO) to form nickel carbonyl complex .(Ni(CO)_{4}) The complex is volatile in nature.

Ni+4CO\overset{330K-350K}{\rightarrow} Ni(CO)_{4})

This complex is decomposed at high temperature to get a pure nickel.

Ni(CO)_{4}\overset{450K-470K}{\rightarrow} Ni+4CO

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