Refining of nickel is done by:

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(D) The refining of nickel is carried out by the $Mond's$ process. In this process,impure nickel is heated in a stream of carbon monoxide $(CO)$ at $3

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Mond's process

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(D) The refining of nickel is carried out by the $Mond's$ process. In this process,impure nickel is heated in a stream of carbon monoxide $(CO)$ at $330-350 \ K$ to form a volatile nickel tetracarbonyl complex,$Ni(CO)_4$. The reaction is: $Ni(s) + 4CO(g) \xrightarrow{330-350 \ K} Ni(CO)_4(g)$. This complex is then decomposed at a higher temperature $(450-470 \ K)$ to obtain pure nickel: $Ni(CO)_4(g) \xrightarrow{450-470 \ K} Ni(s) + 4CO(g)$.

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