Question

why use CO in refining of Ni ?

Answer 1

The Mond process, sometimes known as the carbonyl process, is a technique created by Ludwig Mond in 1890, to extract and purify nickel. ... The impure nickel reacts with carbon monoxide at 50–60 °C to form the gas nickelcarbonyl, leaving the impurities as solids. Ni(s) + 4 CO(g) → Ni(CO)4(g) 3.

Answer 2

Because it is a good reducing reagent .....

Hope it will help u