Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?
Correct answer: C. Silicon carbide
- A. Crystalline magnesia
- B. Silicon nitride
- C. Silicon carbide
- D. Zirconium sulphate
Explanation
Carborundum is the industrial name for silicon carbide, SiC, a hard, refractory material that withstands the high temperatures used for melting non-ferrous metals. Silicon nitride and magnesia are different refractory materials.
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