Question

Which of these changes are physical and
reversible?
(i) burning of coal (ii) freezing of water
(iii) rusting of iron (iv) melting of wax
a) (i) and (iii)
b) (ii) and (iv)
c) (ii) and (iii)
d) (iii) and (iv)​

Answer 1

Explanation:

Difference between physical and chemical changes

Physical changes Chemical changes

The physical properties of the substance change. The chemical properties of the substance change.

Mostly reversible changes. All are irreversible changes.

A new substance is not formed. A new substance is formed.

Answer 2

Answer:

b) (ii) and (iv).......