The chemical composition of 'slag' formed during the smelting process in the extraction of copper is:

C u_{2} S + F e O

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C u_{2} O + F e S

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F e S i O_{3}

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C u F e S_{2}

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Solution

The correct option is C $F e S i O_{3}$
During the extraction process, iron impurities are present in the form of $F e S$ .
The ore is smelted with coke and silica;
$F e S$ present in the smelt is oxidized to $F e O$ , which is removed as slag
in the form of $F e S i O_{3}$ :

$2 F e S + 3 O_{2} ⟶ 2 F e O + S O_{2}$
$F e O + S i O_{2} ⟶ F e S i O_{3}$

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The chemical composition of slag formed during smelting process in the extraction of Cu is

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