_____________ is not a single oxide-refractory?
Correct answer: B. Silicon carbide
- A. Zirconia
- B. Silicon carbide
- C. Magnesia
- D. None of these
Explanation
Zirconia and magnesia are single-oxide refractories because they are based primarily on ZrO2 and MgO. Silicon carbide is a non-oxide ceramic compound of silicon and carbon, so it does not belong to that class.
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