Which of the following is the hardest natural substance?

A. Graphite

B. Diamond

C. Iron

D. Quartz

Doubtly AI Asked 27 Oct 2026 AI-generated · not yet verified ssc cpo Save WhatsApp Report

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Best answer

Answer: B. Diamond

Answer: (B) Diamond

Diamond, an allotrope of carbon in which each atom is bonded to four others, is the hardest natural substance. Graphite, also carbon, is soft.

Doubtly AI · 27 Oct 2026 AI-generated · not yet verified Report

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