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JIPMER 2017

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

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

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

In cyamide extraction process of silver from argentite ore, the oxidising and reducing agents are respectively.

Options

A $\mathrm{O}_2$ and $\mathrm{CO}_2$
B $\mathrm{O}_2$ and Zn dust
C $\mathrm{HNO}_3$ and Zn dust
D $\mathrm{HNO}_3$ and CO

Correct answer

B. $\mathrm{O}_2$ and Zn dust

Step-by-step solution

The extraction of silver involves in cyanide process are (i)

\mathrm{Ag}_2 \mathrm{~S}+2 \mathrm{CN}^{-}+\mathrm{O}_2 \longrightarrow 2\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}+\mathrm{SO}_2

(ii)

\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}+\mathrm{Zn} \longrightarrow\left[\mathrm{Zn}(\mathrm{CN})_4\right]^{2-}+\mathrm{Ag}

Thus, in (i)

\mathrm{O}_2

-act as oxidising agent (oxidise sulphide to

\mathrm{SO}_2

) and in (ii) Zn act as reducing agent (reduce

\mathrm{Ag}^{+}

to Ag ).

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