State the harmful effects of excessive production of sulfur oxide.

How can you apply Green Chemistry for the following?
$(a)$ To reduce photochemical smog.
$(b)$ To avoid the use of chlorinated solvents and chlorinated bleaching agents in dry cleaning.
$(c)$ To reduce the use of synthetic detergents.
$(d)$ To reduce the consumption of petrol and diesel.

Which of the following is not a component of photochemical smog?

Pollution can be controlled by

Match the following List-$I$ ($F^-$ ion concentration in drinking water) with List-$II$ (Effects on humans):

List-$I$	List-$II$
$(A)$ $< 1 \ ppm$	$(i)$ Harmful to bones
$(B)$ $> 2 \ ppm$	$(ii)$ Tooth decay
$(C)$ $> 10 \ ppm$	$(iii)$ Brown mottling of teeth

Then the correct match is:

Match the particulate pollutants given in List-$I$ with their descriptions given in List-$II$.

List-$I$	List-$II$
$(A)$ Smoke	$(1)$ Formed by condensation of vapours during chemical reactions.
$(B)$ Dust	$(2)$ Fine solid particles.
$(C)$ Mist	$(3)$ Produced by particles of spray liquids and by condensation of vapours.
$(D)$ Fumes	$(4)$ Mixture of solid and liquid particles formed by combustion of organic matter.