Blister copper is ..........

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Question

(C) Blister copper is the product obtained after the Bessemerization process in the extraction of copper. During this process,the molten matte $(Cu_2S

Vedclass · Accepted Answer

Both are correct

Vedclass · Answer

(C) Blister copper is the product obtained after the Bessemerization process in the extraction of copper. During this process,the molten matte $(Cu_2S + FeS)$ is oxidized. $FeS$ is removed as slag,and $Cu_2S$ undergoes self-reduction: $2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$ $2Cu_2O + Cu_2S \rightarrow 6Cu + SO_2$ The resulting copper contains dissolved $SO_2$ gas,which forms blisters on the surface upon cooling,hence it is called blister copper. It is approximately $98 \%$ pure copper,which is considered impure and requires further refining (electrolytic refining). Therefore,both statements are correct.

List-$I$	List-$II$
$I.$ Cyanide process	$a.$ Ultrapure $Ge$
$II.$ Froth floatation process	$b.$ Pine oil
$III.$ Electrolytic reduction	$c.$ Extraction of $Al$
$IV.$ Zone refining	$d.$ Extraction of $Au$

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What are the metals and their approximate percentages in German silver?

Match List-$I$ with List-$II$ and select the correct code.

List-$I$ List-$II$

$I.$ Cyanide process $a.$ Ultrapure $Ge$

$II.$ Froth floatation process $b.$ Pine oil

$III.$ Electrolytic reduction $c.$ Extraction of $Al$

$IV.$ Zone refining $d.$ Extraction of $Au$

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In the leaching of $Ag_2S$ with $NaCN$,a stream of air is also passed. This is because of:

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