Flux is used to remove

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(D) Flux is a substance added to the ore to remove gangue (impurities) by forming a fusible material called slag. Depending on the nature of the impur

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Both $(a)$ and $(b)$

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(D) Flux is a substance added to the ore to remove gangue (impurities) by forming a fusible material called slag. Depending on the nature of the impurity,different types of flux are used. If the impurity is acidic (e.g.,$SiO_2$),a basic flux (e.g.,$CaO$) is used. If the impurity is basic (e.g.,$FeO$),an acidic flux (e.g.,$SiO_2$) is used. Therefore,flux is used to remove both acidic and basic impurities.

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