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SSC CPO 2019 PYQ — Question 70

SSC CPO Tier I - 11th December 2019 - Shift 2 • General Awareness • Q70

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Sapphire and ruby are varieties of natural:

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Correct answer: D

Explanation

The correct answer is Option 4 i.e. aluminum oxide.

Aluminum oxide
  • Aluminum oxide is a white odorless crystalline powder.
  • Corundum is a crystalline form of aluminium oxide (Al2O3). 
  • Rubies are red due to the presence of chromium while Saphire is in blue shades to the presence of iron and titanium.
  • Sapphire and Ruby both are the most precious gemstone.