Q20 of 74 Page 207

Which aerosols deplete ozone?

Freons or chlorofluorocarbons [CFCs] are aerosols that accelerate the depletion of ozone. In presence of ultraviolet radiation [UV radiation], these chlorofluorocarbons break down to give chlorine ions which combine with the ozone atoms in the atmosphere to give oxygen atoms.


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18

Why is dioxygen a gas but sulphur a solid?

 19

Knowing the electron gain enthalpy values for O → O– and O → O2– as –141 and 702 kJ mol–1 respectively, how can you account for the formation of a large number of oxides having O2– species and not O–?

(Hint: Consider lattice energy factor in the formation of compounds).

 21

Describe the manufacture of H2SO4 by contact process?

 22

How is SO2 an air pollutant?