Question

The Mond process is used for the

• A. extraction of Mo
• B. Purification of Ni
• C. Purification of Zr and Ti
• D. Extraction of Zn

Answer 1

The Correct Option is B

The Mond process, also known as the Carbonyl Process, is an industrial process primarily used for the purification of nickel (Ni). Let's understand why the correct answer is "Purification of Ni" and rule out the other options.

1. Understanding the Mond Process:
   • It involves the conversion of nickel into its volatile carbonyl compound, nickel carbonyl \text{(Ni(CO)_4)}.
   • The process occurs at a relatively low temperature (50-60°C), allowing nickel to form the volatile compound while impurities do not.
   • Nickel carbonyl is then decomposed at a higher temperature (180-200°C) to yield pure nickel metal and carbon monoxide gas.
2. Ruling out Other Options:
   • Extraction of Mo: Molybdenum (Mo) is typically extracted using roasting and reduction processes, not the Mond process.
   • Purification of Zr and Ti: Zirconium (Zr) and Titanium (Ti) are usually purified using processes like the Kroll process and not by forming volatile carbonyls as they do not form stable carbonyl compounds.
   • Extraction of Zn: Zinc (Zn) is commonly extracted and purified by processes like roasting and electrolysis, rather than by forming carbonyls.

In summary, the Mond process is specifically designed for the purification of nickel by using nickel's ability to form a volatile carbonyl compound at low temperatures, which differentiates it from other metals.