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Which of the following is the major constituent of corundum?
1. Carbon
2. Diamond
3. SiO2
4. Al2O3

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Correct Answer - Option 4 : Al2O3

Explanation:

  • The principal component of corundum and emery is natural aluminum oxide (alumina).
  • Corundum is composed of about 85% aluminum oxide and 15% iron oxide.
  • Emery contains 60% aluminum oxide and 40% iron oxide.

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