_______________ is the hardest oxide and is hence used where high wear resistance at high temperature is required?
Correct answer: C. Alumina
- A. Beryllium
- B. Zirconia
- C. Alumina
- D. Magnesia
Explanation
Alumina is extremely hard, with a Mohs hardness close to 9, and retains strong wear resistance at elevated temperature. Zirconia and magnesia are useful refractory oxides but are not as hard as alumina.
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