(b) What would be the advantages of using hydrocarbons rather than CFCs or HCFs as aerosol propellant to replace CFCs? What is their major disadvantage? (3 Marks) (c) (1) Diatomic chlorine gas is the most stable form of the molecular element present in the air and energy required for the formation of chlorine atom is +125 kJ/mol. Calculate the maximum wavelength of light that can be dissociate the diatomic chlorine into the atomic form. (5 Marks) (ii) Can you see this radiation with your eyes. (1 Mark)