Multiple choice

Which of the following non-metals is very hard?

  1. Sulphur

  2. Diamond

  3. Phosphorus

  4. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diamond is an allotrope of carbon and is known as the hardest naturally occurring substance. While most non-metals are brittle or soft, diamond's unique crystal structure gives it extreme hardness.