Which pollutants are present in the troposphere?

What percentage of the total atmosphere is occupied by the homosphere?

Ultraviolet radiation breaks down $CFC$ molecules to produce .....

An increase in the concentration of $CO_2$ in the atmosphere will result in ........

Match the following metals in drinking water with their maximum prescribed concentration in $ppm$:

List-$I$ (Metal)	List-$II$ (Concentration in $ppm$)
$A$. $Mn$	$I$. $0.05$
$B$. $Zn$	$II$. $5.0$
$C$. $Cd$	$III$. $0.005$
$D$. $Cu$	$IV$. $3.0$

Given below are two statements.
Statement $I$: The non-biodegradable fly ash and slag from the steel industry can be used by the cement industry.
Statement $II$: The fuel obtained from plastic waste is lead-free.
In the light of the above statements,choose the most appropriate answer from the options given below: