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Extraction of Copper

Match the ext...

Question

Match the extraction processes listed in $C o l u m n I$ with metals listed in $C o l u m n I I$ .

$\begin{matrix} C o l u m n I & C o l u m n I I A . & S e l f - r e d u c t i o n & p . & L e a d B . & C a r b o n r e d u c t i o n & q . & S i l v e r C . & C o m p l e x f o r m a t i o n a n d d i s p l a c e m e n t b y m e t a l & r . & C o p p e r D . & D e c o m p o s i t i o n o f i o d i d e & s . & B o r o n \end{matrix}$

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p, r; B.

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q,s; C.

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q; D.

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p, r; B.

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p; C.

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q; D.

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p, r; B.

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s; C.

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q; D.

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r; B.

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p,s; C.

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q; D.

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Solution

The correct option is B A. $⟶$ p, r; B. $⟶$ p; C. $⟶$ q; D. $⟶$ s.
Self-reduction is exhibited by both lead and copper.
$P b S + 2 P b O \to 3 P b + S O_{2}$
$C u_{2} S + 2 C u_{2} O \to 6 C u + S O_{2}$

Surprisingly, lead $a l s o$ undergoes carbon reduction!
The MacArthur-Forrest process is used for the hydrometallurgical extraction or refining of Silver and Gold.

As for boron, it's iodide is unstable above a particular temperature. So crude metal is converted into its iodide (in a sealed container) and then
the iodide is decomposed by heating to get pure metal.

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