Which solvent from the following is used in order to avoid the creation of waste and the pollution of air?

Match List-$I$ and List-$II$:

List-$I$	List-$II$
$(a)$ Carbon monoxide	$(i)$ Carcinogenic
$(b)$ Sulphur dioxide	$(ii)$ Metabolized by pyrus plants
$(c)$ Polychlorinated biphenyls	$(iii)$ Haemoglobin
$(d)$ Oxides of nitrogen	$(iv)$ Stiffness of flower buds

Choose the correct answer from the options given below:

How is ozone gas formed in the atmosphere?

Given below are two statements.
Statement $I:$ In polluted water,values of both dissolved oxygen and $BOD$ are very low.
Statement $II:$ Eutrophication results in a decrease in the amount of dissolved oxygen.
In the light of the above statements,choose the most appropriate answer from the options given below.

The acids responsible for acid rain are ......... .

Which of the following industries is the best source of increasing $CO$ levels in the atmosphere?