Which of the following is not correct about carbon monoxide $(CO)$?

How can domestic waste be used as manure?

The pair of gases responsible for acid rain are

$A$ water sample is considered the cleanest based on which of the following $BOD$ values (in $ppm$)?

The relative contribution of $O_3$,$N_2O$,and $H_2O$ to global warming is in the ratio of ......

Which of the following statements about smog is/are correct?
$(i)$ Smog formed on sunny days contains oxidizing molecules.
$(ii)$ Photochemical smog contains many reactive molecules.
$(iii)$ The main polluting components of smog are oxides of carbon.
$(iv)$ The presence of carbon monoxide in air leads to the formation of ozone in smog.