Q.

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

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a

An acidic flux is needed

b

A basic flux is needed

c

Both acidic and basic fluxes are needed

d

Neither of them is needed

answer is B.

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Detailed Solution

Since silica is acidic impurity the flux must be basic. CaO+SiO2→CaSiO3
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