A) Silica
B) Felspar
C) Limestone
D) Flint
Correct Answer: C
Solution :
Impurities of \[Si{{O}_{2}}\] is present in the iron ore so basic flux \[CaC{{O}_{3}}\] is added. \[\underset{\text{Flux}}{\mathop{CaO}}\,+\underset{\text{Im}\text{purity}}{\mathop{Si{{O}_{2}}}}\,\to \underset{\text{Slag}}{\mathop{CaSi{{O}_{3}}}}\,\]
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