Surface water contains

Methyl mercaptans are generated as waste from which industry?

Which of the following is harmful to calcium-containing structures and is responsible for causing cough and throat irritation in humans?

In municipal sewage,$BOD$ values (in $ppm$) are

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

List-$I$	List-$II$
$(A)$ Phosphate fertilizers in water	$(1)$ Increases $BOD$ value of water
$(B)$ Methane in air	$(2)$ Acid rain
$(C)$ Synthetic detergents in water	$(3)$ Global warming
$(D)$ Nitrogen oxides in air	$(4)$ Eutrophication

Some statements are given:
$(S_1) \ CO_2$ is a greenhouse gas.
$(S_2)$ Classical smog contains smoke,fog,and a high concentration of $SO_2$.
$(S_3) \ DDT$ is biodegradable.
$(S_4)$ Drinking water should have a high $B.O.D.$
Which is the correct sequence of true $(T)$ or false $(F)$ regarding the above statements?