Question

Explain refining of nicket by mond process.
State kohlarausch's law

Answer 1

Monds process is used to extract and purify nickel .

This process has three steps:

1. Nickel oxide reacts with syngas at 200 °C to give nickel, together with impurities including iron and cobalt.

NiO(s) + H₂(g) → Ni(s) + H₂O(g)

2. The impure nickel reacts with CO at 50–60 °C to form the gas nickel carbonyl, leaving the impurities as solids.

Ni(s) + 4 CO(g) → Ni(CO)₄(g)

3. The mixture of nickel carbonyl and Syngas is heated to 220–250 °C, resulting in decomposition back to nickel and carbon monoxide:

Ni(CO)₄(g) → Ni(s) + 4 CO(g)

Kahlaraush law states that that the equivalent conductivity of an electrolyte at infinite dilution is equal to the sum of the conductances of the anions and cations