Question

Find the one item that does not belong to each of these groups. Explain your answer:
(a) aluminium, cork, paper, soap
(b) salt, sugar, sand, wheat flour
(c) windowpane, cellophane paper, mirror, air
(d) cooking oil, water, kerosene, petrol

Answer 1

(a) Aluminium; as it is a metal. The rest are non-metals.
(b) Sand; as it is not edible.
(c) Air; as it is a gas. The other three are solids.
(d) Water; as it is non-flammable. The rest are inflammable.