BITSAT 2017

Exam: BITSAT
Year: 2017
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

BITSAT 2017 · Chemistry · General Principles and Processes of Isolation of Metals

Which of the following metal is leached by cyanide process&

Options

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

Correct answer

A. $Ag$

Step-by-step solution

Cyanide process, which is also known as MacArthur cyanide process involves the extraction of gold and silver from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide.& The leaching is carried out in the presence of air or oxygen to oxidise the metal.

$Ag$ is leached by cyanide process by making the complex using $NaCN / KCN$ as follows

${Ag}_{2}S + 4NaCN ⟶ 2\mathop{Na\left[Ag ( CN{)}_{2}\right]}_{Soluble} + {Na}_{2}S$

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