Multiple choice general knowledge science & technology

The hardest substance available on earth is

  1. Gold

  2. Coal

  3. Diamond

  4. Platinum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Diamond is the hardest known natural material, composed of carbon atoms arranged in a tetrahedral lattice structure. Each carbon forms four strong covalent bonds, creating extreme hardness. Gold, coal and platinum are all much softer on the Mohs scale.

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