A) \[Si{{O}_{2}}\],which is an acidic flux
B) lime stone, which is a basic flux
C) \[Si{{O}_{2}}\], which is a basic flux
D) CaO, which is a basic flux.
Correct Answer: A
Solution :
[a] : FeO (being basic) combines with silica \[(Si{{O}_{2}})\]an acidic flux to give \[FeSi{{O}_{3}}\]slag. \[FeO+Si{{O}_{2}}\xrightarrow[{}]{{}}\underset{(slag)}{\mathop{FeSi{{O}_{3}}}}\,\]
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