Questions & Answers

Which metal is refined by the Mond Process?

Answer Verified Verified
Hint: Mond process involves the formation of carbonyl compounds under the mild conditions used in this process. Nickel is the only element that can form carbonyl compounds under those conditions.

Complete step by step answer:
The Mond process is a technique created by Ludwig Mond in 1890. This process is also known as carbonyl process as this process involves the combination of carbon monoxide with nickel readily and reversibly and gives nickel tetracarbonyl. This process is used to extract and purify nickel.
This process converts nickel oxides to nickel metal with very high purity.
Mond process for extraction of Nickel involves three steps:
(i) In the first process, syngas which is a mixture of hydrogen gas and carbon monoxide gas, is combined with nickel oxide at ${200^ \circ }C$ with impurities iron and cobalt.
$NiO(s) + {H_2}(g) \to Ni(s) + {H_2}O(g)$
In the next process, the carbon monoxide reacts with impure nickel to form nickel tetracarbonyl, the impurities will remain as solids.
$Ni(s) + 4CO(g)\xrightarrow{{{{50}^ \circ } - {{60}^ \circ }C}}Ni{(CO)_4}(g)$
Then the mixture of syngas and nickel carbonyl is heated. This results in the decompositions back to carbon monoxide and nickel.
$Ni{(CO)_4}(g)\xrightarrow{{{{250}^ \circ } - {{270}^ \circ }C}}Ni(s) + 4CO(g)$
Pure Nickel is collected and carbon monoxide is recycled to continue the process.
As this process can be used to extract and purify Nickel.
Therefore, option (C) is correct.

Note:The Mond process is a method for refining nickel. The nickel oxide and impurities react with the hydrogen gas to form an impure solid nickel. Nickel reacts with the carbon monoxide, forming nickel carbonyl, a gas. The impurities remain as solids.