Which term is used for the heat-trapping ability of greenhouse gases?

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$(a)$ $2 SO_{2(g)} + O_{2(g)} \rightarrow 2 SO_{3(g)}$	$(i)$ Acid rain
$(b)$ $HOCl_{(g)} \stackrel{h \nu}{\longrightarrow} \dot{O}H + \dot{Cl}$	$(ii)$ Smog
$(c)$ $CaCO_{3} + H_{2}SO_{4} \rightarrow CaSO_{4} + H_{2}O + CO_{2}$	$(iii)$ Ozone depletion
$(d)$ $NO_{2(g)} \stackrel{h \nu}{\longrightarrow} NO_{(g)} + O_{(g)}$	$(iv)$ Tropospheric pollution

Choose the correct answer from the options given below.

Acid rain is mainly caused by the emissions of which of the following gases?
$I.$ Sulphur dioxide
$II.$ Carbon dioxide
$III.$ Nitrogen dioxide
$IV.$ Methane

Match the following:

List-$I$ (Pollutant concentration limit in water)	List-$II$ (Effect)
$A. Pb > 50 \ ppb$	$I. \text{Liver damage}$
$B. SO_4^{2-} > 500 \ ppm$	$II. \text{Laxative effect}$
$C. NO_3^{-} > 50 \ ppm$	$III. \text{Blue baby syndrome}$
$D. F^{-} > 2 \ ppm$	$IV. \text{Brown mottling of teeth}$

The correct answer is

Environmental pollution is the effect of undesirable changes in the properties of our air,land,water,or soil that may harmfully affect...

Which of the following metal pollutants is present in the exhaust fumes of vehicles?