What are Rubies and Sapphires chemically known as ? - Study24x7
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UPSC & State PSC
1008 followers study24x7 12 Feb 2019 05:26 PM study24x7 study24x7

What are Rubies and Sapphires chemically known as ?

A

Lead tetroxide

B

Silicon dioxide

C

Boron nitride

D

Aluminium oxide

UPSC
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