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# When a metal is to be extracted from its ore and the gangue associated with the silica, then

$(a)\;\text{An acidic flux is needed } \\(b)\;\text{A basic flux is needed } \\(c)\;\text{ Both acidic and basic fluxes are needed } \\ (d)\;\text{ Neither of them is needed }$

When a metal is to be extracted from its ore and the gangue associated with the silica, then a basic flux is needed
Hence b is the correct answer.

Both acidic flux and basic flux