MCQ practice · SSC Chemistry Board questions · Chapter 10: Mineral Resources: Metals and Non-metals
If the gangue is basic, which of these is added as flux?
Think it through first, then pick an option.
- a CaO
- b MgO
- c Al₂O₃
- d SiO₂
Answer and explanation
Correct answer: d SiO₂
If the gangue is basic, the acidic flux SiO₂ is added.
Why the other options are wrong
- a CaO: CaO is the basic flux, used for acidic gangue; basic gangue gets SiO₂.
- b MgO: MgO is a basic oxide and is not a flux in the book; the answer is SiO₂.
- c Al₂O₃: Al₂O₃ is not a flux in the book; basic gangue takes the acidic flux SiO₂.
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