A) catalyst
B) gangue
C) flux
D) slag
Correct Answer: C
Solution :
Flux is added to roasted ore in order to remove impurities in form of slag, which floats above the molten reduced metal in smelting process, e.g., \[\underset{\begin{smallmatrix} \,\,\,\,\,\,\text{Impurity}\,\text{in} \\ \text{iron-extraction} \end{smallmatrix}}{\mathop{MnO}}\,+\underset{\text{flux}}{\mathop{Si{{O}_{2}}}}\,\xrightarrow{{}}\underset{\text{Slag}}{\mathop{MnSi{{O}_{3}}}}\,\]
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