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$CO$ form a volatile compound with: -A.NickelB.CopperC.SodiumD.Aluminium

Last updated date: 21st Mar 2023
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Hint: Mond process is used for the extraction of nickel. In this nickel forms an intermediate and volatile compound which also dissociates easily to give pure nickel. Nickel usually comes with a lot of impurities in its ore so needs to be cleaned before using for further purposes.

Carbon monoxide later on reacts with the impure nickel metal. Now nickel is a block element which exists generally in the $+ 2$ oxidation state. Here in its last orbital the s and p orbitals are completely empty and as the nickel is large and $CO$ is a very strong ligand. $CO$ attacks at the s and p orbitals and occupies four orbitals, resulting in the formation of a volatile compound named $Ni{(CO)_4}(g)$. This a gaseous compound and very volatile which very easily dissociates and gives out the pure nickel.
$CO$ forms a volatile compound with nickel. The volatile compound formed is called $Ni{(CO)_4}(g)$ and the process is called Mond’s Process.