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a
CaO
b
MgO
c
SiO2
d
CaH2
answer is C.
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Detailed Solution
An acidic flux [eg: SiO2] is a chemical substance which removes the basic impurities like MnO,FeO,CgOCaOBasic impurityORGangue+SiO2Acid flux→∆CaSiO3↑Slag FeO+SiO2→∆FeSiO3slagthe flux combines with the impurity to form slag→ MgO, CaO are basic flux