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 requiresonly oxygen(ii) only water(iii) both air and water(iv) none of these

Tick (/) the correct option. (a) Crystallisation is a(1) chemical ch

1.	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 requiresonly oxygen(ii) only water(iii) both air and water(iv) none of these
Answer» a) CHEMICAL CHANGE B) both AIR and WATER