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Which flux can be used to remove a metal oxide impurity from a sulphide ore of noble metal? Substantiate.

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Which flux can be used to remove a metal oxide impurity from a sulphide ore of noble metal? Substantiate.

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Silica, SiO2 .

Generally, metal oxides are basic in nature. To remove basic impurities an acidic flux like SiO2 is used.

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