The chemical composition of slag formed during the smelting process in the extraction of copper is
(IIT-JEE, 2001)

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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C u_{2} S + F e O

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Solution

The correct option is B $F e S i O_{3}$
When smelting is done in the blast furnace, most of the ferrous oxide is converted to ferric oxide. With silica, it forms ferrous silicate, which is the slag.
$F e O + S i O_{2} \to F e S i O_{3}$

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

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