Question

Which of the following is a chemical change?

(a) Melting of wax
(b) Dissolving sugar in water
(c) Burning of paper
(d) Boiling of water into steam

Answer 1

Answer:

Answer C Burning of paper

Answer 2

Answer:

(C) Burning of paper

Explanation:

a) Melting of wax is not a chemical change as only the state of matter of wax is being changed.

b) Dissolving of sugar in water is also not a chemical change as the particles of sugar are just arranged them among water molecules.

c) Burning of paper is a chemical change as black organic matter is produced during the combustion of paper.

d) Boiling of water into steam is also a physical change as the state of water is being changed but not its chemical composition.