Question

Which of the following are chemical changes?
(i) Breaking down of ozone into oxygen
(ii) Heating of hacksaw blade to red hot stage
(iii) Acid rain
(iv) Beating aluminium to make aluminium foil
(A) (i), (ii) and (iii) (B) (i) and (iii)
(C) (ii) and (iv) (D) (ii), (iii) and (iv)

Answer 1

Answer:

(i) Breaking down of ozone into oxygen

Explanation:

(i) Breaking down of ozone into oxygen