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JEE Main 202329 JanuaryMorning Shift

Exam: JEE Main
Year: 2023
Date: 29 January
Shift: Morning Shift
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JEE Main 2023 · 29 January · Morning Shift · Chemistry · General Principles and Processes of Isolation of Metals

The reaction representing the Mond process for metal refining is...

The reaction representing the Mond process for metal refining is ______

Options

A $Ni + 4CO\overset{\Delta}{⟶}Ni ( CO{)}_{4}$
B $2K\left[Au ( CN{)}_{2}\right] + Zn\overset{\Delta}{⟶}{K}_{2}\left[Zn ( CN{)}_{4}\right] + 2Au$
C $Zr + 2{I}_{2}\overset{\Delta}{⟶}{ZrI}_{4}$
D $ZnO + C\overset{\Delta}{⟶}Zn + CO$

Correct answer

A. $Ni + 4CO\overset{\Delta}{⟶}Ni ( CO{)}_{4}$

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:

$Ni + 4CO\overset{330 - 350K}{\to}Ni ( CO{)}_{4}$

The carbonyl is subjected to a higher temperature so that it is decomposed giving the pure metal:

$Ni ( CO{)}_{4}\overset{450 - 470K}{\to}Ni + 4CO$

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