Which catalyst is used in the oxidation of $SO_2$ to $SO_3$?

Match the following.

List-$I$ (Reaction)	List-$II$ (Catalyst)
$A$. $N_{2(g)} + 3H_{2(g)} \longrightarrow 2NH_{3(g)}$	$I$. $Ni$
$B$. $2H_{2(g)} + O_{2(g)} \longrightarrow 2H_2O_{(l)}$	$II$. $Pt$
$C$. $CO_{(g)} + 3H_{2(g)} \longrightarrow CH_{4(g)} + H_2O_{(g)}$	$III$. $ZnO-Cr_2O_3$
$D$. $CO_{(g)} + 2H_{2(g)} \longrightarrow CH_3OH_{(g)}$	$IV$. $Fe$

The correct answer is:

$A$ catalyst in a chemical reaction

Which of the following catalysts and processes is incorrectly matched?

The correct statements about Zeolites are:
$(I)$ They are good shape-selective catalysts.
$(II)$ They contain $Al-O-Si$ framework.
$(III)$ They are not found in nature.
$(IV)$ They are used as catalysts for cracking hydrocarbons in the petrochemical industry.

In the oxidation of oxalic acid by $KMnO_4$,the color of $KMnO_4$ disappears slowly at the beginning of the reaction,but then it disappears very rapidly. This is an example of .......