Question

Name the method used for the refining of Nickel metal.

Answer 1

$Ni$ is refined by Mond's process. In this process, nickel is heated in the presence of carbon monoxide to form nickel tetracarbonyl, which is a volatile complex.

$Ni+4CO\underrightarrow{330-350K}Ni(CO{)}_4$

$Ni(CO{)}_4\underrightarrow{450-470K}Ni+CO$

Then, the obtained $Ni(CO{)}_4$ is decomposed by subjecting it to a higher temperature $(450-470)$ to obtain $Ni$ metal.