A) acidic flux only
B) gangue only
C) basic flux only
D) both gangue and acidic flux
Correct Answer: D
Solution :
When \[Si{{O}_{2}}\] (silica) is present as earthly impurity in an ore, it is called gangue and when it is added to remove basic impurities like \[CaO,\text{ }FeO~\] etc. It is called an acidic flux.
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