Question

Which of the following metals is refined by vapour phase refining in Mond process?

Options

• Zn

• Zr

• Si

• Ni

Answer 1

Ni

Explanation:

The vapour phase refining technique refines nickel (Ni) metal. Nickel interacts with carbon monoxide to generate highly volatile nickel tetracarbonyl, which decomposes at high temperatures to yield pure nickel metal.

\[\ce{\underset{\text{Impure metal}}{Ni + 4CO} ->[330-350 K] Ni(CO)4}\]

\[\ce{Ni(CO)4 ->[450-470 K] \underset{\text{Pure metal}}{Ni + 4CO}}\]