JEE Main 202324 JanuaryEvening Shift

Exam: JEE Main
Year: 2023
Date: 24 January
Shift: Evening Shift
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JEE Main 2023 · 24 January · Evening Shift · Chemistry · General Principles and Processes of Isolation of Metals

The metal which is extracted by oxidation and subsequent reduction...

The metal which is extracted by oxidation and subsequent reduction from its ore is :

Options

A $Al$
B $Ag$
C $Cu$
D $Fe$

Correct answer

B. $Ag$

Step-by-step solution

Cyanide process, also called Macarthur-forrest Process, method of extracting silver and gold from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide. The following redox reaction takes place during the extraction process.

$4Ag + 8{CN}^{- 1} + {O}_{2} + 2{H}_{2}O \to 4 [ Ag ( CN{)}_{2} ] + 4{OH}^{-}$

$2{\left[Ag{\left(CN\right)}_{2}\right]}^{- 1} + Zn \to 2Ag ↓ + {\left[Zn{\left(CN\right)}_{4}\right]}^{- 2}$

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