(a)     (i)     Explain the dependence of the dissociation of diatomic oxygen, O₂, and ozone, O₃, on the wavelength of light.

(ii)     State the equations for the formation and depletion of ozone in the stratosphere by natural processes.

Formation of ozone:

Depletion of ozone:

(b)     (i)     State the equations for the depletion of ozone by the CFC, dichlorodifluoromethane, CCl₂F₂.

(ii)     Use your answer to part (b) (i) to explain why CFCs are so effective at ozone depletion.