Question

Elements and their processes of extraction/purification are given. The correct pair(s) is/are

• A. Na; Downs process
• B. Ni; Mond process
• C. B; Frasch process
• D. Al; Bayer process

Answer 1

The Correct Option is A, B

• (A) The Downs process is used to extract sodium (Na) from molten sodium chloride (NaCl) by electrolysis.
• (B) The Mond process is used to purify nickel (Ni). In this process, nickel reacts with carbon monoxide to form a volatile nickel carbonyl compound, which is then decomposed to produce pure nickel.
• (C) The Frasch process is used for the extraction of sulfur, not boron (B). It involves the injection of hot water and air into sulfur deposits to melt the sulfur, which is then pumped to the surface.
• (D) The Bayer process is used for the extraction of aluminum (Al) from bauxite ore, not for the purification of boron. In this process, bauxite is treated with sodium hydroxide to produce alumina (Al₂O₃), from which aluminum is extracted.

Thus, the correct answers are (A) and (B).