Q. What are rubies and sapphires chemically known as?

  • (A) Silicon dioxide
  • (B) Aluminium oxide
  • (C) Boron nitride
  • (D) Lead tetraoxide
✅ Correct Answer: (B) Aluminium oxide

Published by Ram Sharma ⭐ 193.88K Points at 30-Mar-2022 09:19 pm in General Awareness

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