Multiple choice

The chemical name of saltpeter is _____________.

  1. ferrous sulphate

  2. copper sulphate

  3. magnesium sulphate

  4. potassium nitrate

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

Saltpeter (or saltpetre) is the common name for potassium nitrate, KNO3. It has historically been used in gunpowder and fertilizers.