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Q.

An ore after levigation is found to have basic impurities. Which of the following can be used as flux during smelting?

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a

H2SO4

b

CaCO3

c

SiO2

d

Both CaO and SiO2

answer is C.

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Detailed Solution

Acidic flux is used. It is an acidic oxide (oxide of a nonmetal) like SiO2,P2O5,B2O3 (from borax). It is used to remove the basic impurity like CaO, FeO, MgO, etc. The acidic flux combines with the basic impurity and forms a slag.
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