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Q.

The hardest mineral found on the earth is


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a

Talc

b

Coal

c

Diamond

d

Iron 

answer is C.

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Detailed Solution

The hardest known mineral is diamond. It is a carbon allotrope with excellent symmetry (C). It is the hardest mineral, with a Mohs "scratch" hardness rating of 10. Thus, 3  is the correct Ans.
 
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