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(C) $1$. $SO_2$: Acid rain. Nitrogen oxides and sulphur dioxide react with water droplets in clouds to form sulphuric and nitric acids, resulting in a

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$A-II, B-I, C-IV, D-III$

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(C) $1$. $SO_2$: Acid rain. Nitrogen oxides and sulphur dioxide react with water droplets in clouds to form sulphuric and nitric acids, resulting in acid rain.$2$. $PAN$: Photochemical smog. Peroxyacetyl nitrate $(PAN)$ is a phytotoxic air pollutant formed by the reaction of hydrocarbons and nitrogen oxides in the presence of sunlight.$3$. Smoke: Particulate. Smoke consists of a mixture of solid particles and liquid droplets suspended in the air.$4$. $CF_2Cl_2$: Stratospheric pollutant. Chlorofluorocarbons like $CF_2Cl_2$ are responsible for the depletion of the ozone layer in the stratosphere.

Column $I$	Column $II$
$A$. $SO_2$	$I$. Photochemical smog
$B$. $PAN$	$II$. Acid rain
$C$. Smoke	$III$. Stratospheric pollutant
$D$. $CF_2Cl_2$	$IV$. Particulate

Match the following.

Column $I$ Column $II$

$A$. $SO_2$ $I$. Photochemical smog

$B$. $PAN$ $II$. Acid rain

$C$. Smoke $III$. Stratospheric pollutant

$D$. $CF_2Cl_2$ $IV$. Particulate

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Match the following. Column $I$ Column $II$ $A$. $SO_2$ $I$. Photochemical smog $B$. $PAN$ $II$. Acid rain $C$. Smoke $III$. Stratospheric pollutant $D$. $CF_2Cl_2$ $IV$. Particulate