(D) Flux is a substance added to the ore during smelting to remove gangue (impurities) by forming an easily fusible material called slag.If the impuri

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(D) Flux is a substance added to the ore during smelting to remove gangue (impurities) by forming an easily fusible material called slag.If the impurity is acidic (e.g.,$SiO_2$),a basic flux (e.g.,$CaO$) is added.If the impurity is basic (e.g.,$FeO$),an acidic flux (e.g.,$SiO_2$) is added.Therefore,flux is used to remove both acidic and basic impurities.