'Super refractories' are made from pure____________________?
Correct answer: B. Oxides
- A. Carbides
- B. Oxides
- C. Borides
- D. Nitrides
Explanation
Super refractories are generally produced from very pure, high-melting oxides such as alumina, magnesia, zirconia, and thoria. Carbides, borides, and nitrides are special non-oxide refractory materials rather than the usual classification intended here.
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