The chemical added to leaded petrol to prevent the deposition of lead in the combustion chamber is

Addition of phosphate fertilisers to water bodies causes

Oxides of sulfur and nitrogen are pollutants of which of the following?

Which of the following causes the depletion of the ozone layer in the stratosphere?

Which of the following is not an air pollutant?

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.