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JEE Main202329 Jan 2023Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

The reaction representing the Mond process for metal refining is ______

Options

  1. ANi + 4 CO ⟶ Δ Ni ( CO ) 4
  2. B2 K Au ( CN ) 2 + Zn ⟶ Δ K 2 Zn ( CN ) 4 + 2 Au
  3. CZr + 2 I 2 ⟶ Δ ZrI 4
  4. DZnO + C ⟶ Δ Zn + CO

Correct answer

A. Ni + 4 CO ⟶ Δ Ni ( CO ) 4

Step-by-step solution

Mond process for metal refining: In this process, nickel is heated in a stream of carbon monoxide forming a volatile complex, nickel tetracarbonyl: Ni   +   4 CO   → 330   -   350 K   Ni ( CO ) 4 The carbonyl is subjected to a higher temperature so that it is decomposed giving the pure metal: Ni ( CO ) 4   → 450   -   470 K   Ni   +   4 CO

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