JEE Main · 2023 · 29 Jan 2023 · Shift 1 · General Principles and Processes of Isolation of Metals

The reaction representing the Mond process for metal refining is ____

(A) $Ni + 4 CO Δ Ni (CO)_{4}$ ✓ Correct
(B) $2 K [Au (CN)_{2}] + Zn Δ K_{2} [Zn (CN)_{4}] + 2 Au$
(C) $Zr + 2 I_{2} Δ Zr I_{4}$
(D) $ZnO + C Δ Zn + CO$

Answer: (A)

Solution

The Mond process refines nickel by using the ease with which it forms a volatile carbonyl. Warm impure nickel is passed over carbon monoxide to give gaseous nickel tetracarbonyl, which separates from the non-volatile impurities and is then decomposed at a higher temperature to deposit pure nickel. The reaction that represents this process is

Ni + 4 CO Δ Ni (CO)_{4}

JEE Main · 2023 · 29 Jan 2023 · Shift 1 · Single correct option

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