JEE Advanced 2012Paper 2

Exam: JEE Advanced
Year: 2012
Paper: Paper 2
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JEE Advanced 2012 · Paper 2 · Chemistry · General Principles and Processes of Isolation of Metals

In the cyanide extraction process of silver from argentite ore, the...

In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are

Options

A $\mathrm{O}_{2}$ and $\mathrm{CO}$ respectively
B $\mathrm{O}_{2}$ and $\mathrm{Zn}$ dust respectively
C $\mathrm{HNO}_{3}$ and $\mathrm{Zn}$ dust respectively
D $\mathrm{HNO}_{3}$ and $\mathrm{CO}$ respectively

Correct answer

B. $\mathrm{O}_{2}$ and $\mathrm{Zn}$ dust respectively

Step-by-step solution

The reactions involved in cyanide extraction process are:

\underset{\text{ (argentite) }}{\mathrm{Ag}_{2} \mathrm{~S}}+4 \mathrm{NaCN} \rightarrow 2 \mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]+\mathrm{Na}_{2}

\mathrm{~S}

4

\mathrm{Na}_{2} \mathrm{~S}+

\underset{\text{ Oxiding agent }}{5

\mathrm{O}_{2}

}+2

\mathrm{H}_{2} \mathrm{O}

\rightarrow 2

\mathrm{Na}_{2} \mathrm{SO}_{4}+

\mathrm{NaOH}+

2 \mathrm{~S} 2 \mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]+\underset{\begin{\text{ array }}{c}\text{ (reducing } \\ \text{ agent) }\end{\text{ array }}}{\mathrm{Zn}} \rightarrow \mathrm{Na}_{2}\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]+2 \mathrm{Ag} \downarrow

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