More than 95% of _______________ is present in corundum ?
Correct answer: B. Al2O3
- A. SiO2
- B. Al2O3
- C. CaSiO2
- D. MgO
Explanation
Corundum is primarily crystalline aluminium oxide, Al2O3, commonly containing more than 95% of this compound. The other listed oxides are not its principal constituent.
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