The slag obtained during the extraction of copper from copper pyrites is composed mainly of

C a S i O_{3}

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F e S i O_{3}

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C u S i O_{3}

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S i O_{2}

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Solution

The correct option is B $F e S i O_{3}$
The chemical formula of copper pyrites is $C u F e S_{2}$
In the process of roasting, since it contains iron it is mixed with silica before heating and iron oxide slags of as iron silicate.

$F e O + S i O_{2} \to F e S i O_{3} slag$ .

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{F e S i O}_{3}

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