Question

Explain Mond's process used for refining of nickel.

Answer 1

Mond process for refining of Nickel is based on the principle that nickel is heated in the presence of carbon monoxide to form nickel tetracarbonyl, which is a volatile copound.

$Ni+4CO\stackrel{330-350K}{\to }\underset{\left(\text{Nickel tetracarbonyl}\right)}{Ni{\left(CO\right)}_4}$

Now, the obtained nickel tetracarbonyl is decomposed by subjecting it to a higher temperature $(450-470K)$ to obtain pure nickel metal.

$\underset{\left(\text{Nickel tetracarbonyl}\right)}{Ni{\left(CO\right)}_4}\stackrel{450-470K}{\to }\underset{\left(\text{Pure nickel}\right)}{Ni}+4CO$