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 H20
Iron - Made of Fe
Hydrochloric Acid- Made of HCl
Calcium Oxide - Made of CaO
Mercury - Made of Hg
