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(A) The purification of $Ni$ (Nickel) is carried out by the $Mond's$ process.In this process,impure nickel is heated in a stream of carbon monoxide $(

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Mond's process

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(A) The purification of $Ni$ (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 complex,nickel tetracarbonyl,$[Ni(CO)_4]$.The reaction is: $Ni(s) + 4CO(g) \xrightarrow{330-350 \ K} [Ni(CO)_4](g)$.This complex is then heated to a higher temperature $(450-470 \ K)$,causing it to decompose to give pure nickel.The reaction is: $[Ni(CO)_4](g) \xrightarrow{450-470 \ K} Ni(s) + 4CO(g)$.

Which method is used for the purification of $Ni$?

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