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What are Rubies and Sapphires chemically known as A. Silicon dioxide B. Aluminium oxide C. Lead tetra oxide D. Boron nitride

What are Rubies and Sapphires chemically known as  
 
A. Silicon dioxide
B. Aluminium oxide
C. Lead tetra oxide
D. Boron nitride

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60787 Points
3 years ago
Answer :
B
. Aluminium oxide


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