NEET 2023 Chemistry question on Surface Chemistry

1. A.
   Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen
2. B.
   Hydrolysis of sugar catalysed by $\text{H}^+$ ions
3. C.
   Decomposition of ozone in presence of nitrogen monoxide
4. D.
   Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron

[NEET 2023]