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  4. Silica is a/an:

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Q. Silica is a/an:

General Principles and Processes of Isolation of Elements

Solution:

When $SiO _{2}$ (silica) is present as earthly impurity in an ore, it is called gangue and when it is added to remove basic impurities like $CaO , FeO ,$ etc., it is called acidic flux.