Question : Sapphire and Ruby are varieties of natural:
Option 1: Aluminium sulphide
Option 2: Aluminium hydroxide
Option 3: Aluminium carbonate
Option 4: Aluminium oxide
Correct Answer: Aluminium oxide
Solution : The correct answer is Aluminium oxide .
Sapphire and Ruby are varieties of natural Aluminium oxide. Sapphires and Rubies are both the gem varieties of mineral corundum. Both have the same chemical composition and structure, and they get their colour because of certain impurities contained in the mineral. Sapphire and Ruby are one of the hardest minerals after Diamond.
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