(A) In metallurgy,a flux is a chemical substance added to the ore during smelting to remove gangue (impurities). It reacts with infusible impurities (

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converts infusible impurities into fusible form.

(A) In metallurgy,a flux is a chemical substance added to the ore during smelting to remove gangue (impurities). It reacts with infusible impurities (like $SiO_2$) to form a fusible substance known as slag (e.g.,$CaSiO_3$). Therefore,the flux converts infusible impurities into a fusible form.