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Extraction of Copper

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Question

Why is partial roasting of sulphide ore done in metallurgy of copper?

A

Auto-reduction of

C u O

formed is carried out by remaining

C u S

in the reaction.

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B

C u

is separated out by partial reduction due to sedimentation.

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C

Due to difference in gravity

C u O

and

C u S

are separated.

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D

Complete roasting cannot be done in one step hence partial roasting is done.

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Solution

The correct option is C Auto-reduction of $C u O$ formed is carried out by remaining $C u S$ in the reaction.
Partial reduction of Sulphide ores gives copper oxide which further reacts with copper sulphide to show an auto reduction.
$2 C u S + 3 O_{2} ⟶ 2 C u O + 2 S O_{2}$
$2 C u O + C u S A u t o r e d u c t i o n ⟶ 3 C u + S O_{2}$

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