Question

Tick (/) the correct option.
(a) Crystallisation is a
(1) chemical change
(ii) physical change
(iii) Irreversible change
(iv) none of these
(b) Rusting of iron requires
only oxygen
(ii) only water
(iii) both air and water
(iv) none of these​

Answer 1

Answer:

a) chemical change

b) both air and water