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SSC GD 2019 PYQ — Question 43

SSC GD Constable (English) - 11 Feb 2019 Shift 2 • General Awareness • Q43

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Which of the following is the hardest substance?

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Correct answer: B

Explanation

The correct answer is option 2 i.e. Diamond.

  • Diamond is the hardest substance.
  • The outermost shell of each carbon atom has four electrons and these electrons are shared with four other carbon atoms to form very strong chemical bonds.
  • They form a rigid tetrahedral crystal.