The extraction of nickel involves:

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(C) The extraction of nickel is carried out by the $Mond$ process. In this process,impure nickel is heated in a stream of carbon monoxide to form vola

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The formation and thermal decomposition of $Ni(CO)_4$

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(C) The extraction of nickel is carried out by the $Mond$ process. In this process,impure nickel is heated in a stream of carbon monoxide to form volatile nickel tetracarbonyl,$Ni(CO)_4$. $Ni(s) + 4CO(g) \xrightarrow{330-350 \ K} Ni(CO)_4(g)$ This volatile complex is then subjected to higher temperatures,causing it to decompose into pure nickel and carbon monoxide. $Ni(CO)_4(g) \xrightarrow{450-470 \ K} Ni(s) + 4CO(g)$ Therefore,the process involves both the formation and thermal decomposition of $Ni(CO)_4$.

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Formation of $Ni(CO)_4$ and its subsequent decomposition into $Ni$ and $CO$ (recycled) forms the basis of the Mond process.
$Ni + 4CO$ $\xrightarrow{T_1} Ni(CO)_4$ $\xrightarrow{T_2} Ni + 4CO$
$T_1$ and $T_2$ are:

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