Which is the hardest natural substance?

Static GK (Culture, Books, Sports, Firsts) · General Awareness · Medium · Practice for RRB Group D, RRB NTPC CBT 1, SSC CGL Tier 1, SSC CGL Tier 2, SSC CHSL Tier 1

Which is the hardest natural substance?

Graphite
Quartz
Diamond
Iron

Answer and solution

Correct answer: C) Diamond

Diamond rates 10 on the Mohs scale.

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