The reaction representing the Mond process for metal… — JEE Main 2023 Chemistry PYQ

JEE Main 2023 · 29 Jan · Shift 1

The reaction representing the Mond process for metal refining is

2K[Au(CN)_2] + Zn \xrightarrow{\Delta} K_2[Zn(CN)_4] + 2Au

A.
$2K[Au(CN)_2] + Zn \xrightarrow{\Delta} K_2[Zn(CN)_4] + 2Au$
B.
$ZnO + C \xrightarrow{\Delta} Zn + CO$
C.
$Zr + 2I_2 \xrightarrow{\Delta} ZrI_4$
D.
$Ni + 4CO \xrightarrow{\Delta} Ni(CO)_4$

Show answer and solution

Correct option: D

Solution

The Mond process specifically involves the formation of a volatile metal carbonyl. Nickel reacts with CO at around 50–60°C to form tetracarbonylnickel, Ni(CO)₄, a volatile compound that is then decomposed at higher temperature (~230°C) to deposit pure nickel. This use of CO to form and then decompose a volatile carbonyl complex is the defining feature of the Mond process for refining nickel.

[JEE Main 2023 · 29 Jan · Shift 1]

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