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Dolomite contains both magnesium and calcium

Extraction of lead from galena involves roasting in limited supply of air at moderate temperature followed by self-reduction at higher temperature.

Extraction of zinc from zinc blende involves roasting followed by reduction with carbon.

The chemical composition of ‘slag’ formed during the extraction of iron is $F e S i O_{3}$

answer is A, B, C.

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Lead undergoes self-reduction

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