In the extraction of nickel by Mond process, the metal is obtained by:

• A. Electrochemical reduction
• B. Thermal decomposition
• C. Chemical reduction by aluminum
• D. Reduction by carbon

The Mond process is a method used to extract nickel from its ores. In this process, nickel is first converted into nickel carbonyl gas, which is then decomposed to yield pure nickel metal. The correct answer to your question is:

Answer

B. Thermal decomposition

How the Mond Process Works

• The nickel ore is treated with carbon monoxide to form nickel carbonyl.
• This gas is then heated, causing it to decompose and release pure nickel.

This method is efficient and allows for the production of high-purity nickel, making it a preferred choice in the industry.