Which of the following materials fall in the category of a “pure
substance”?
(a) Ice
(b) Milk
(c) Iron
(d) Hydrochloric acid
(e) Calcium oxide
(f) Mercury
(g) Brick
(h) Wood
(i) Air.
Answer
The substances that are made up of only one type of particles are called pure substances.
Hence, the pure substances in the above list are
- Ice - made of H 2 O
- Iron - Made of Fe
- Hydrochloric Acid - Made of HCl
- Calcium Oxide - Made of CaO
- Mercury - Made of Hg
