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Which is the hardest natural substance known?

2424Medium DSSSB TGT Computer Science 0 replies 1 views
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Which is the hardest natural substance known?

  • AQuartz
  • BDiamond
  • CGraphite
  • DCorundum
Correct answer: B

Explanation

Diamond, a crystalline form of carbon, is the hardest naturally occurring substance (10 on the Mohs scale).
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