Chemistry - Complete d-block Question with Solution | TestHub

${\text{V}}_2{\text{O}}_5$ is used as a catalyst in the Contact process for the oxidation of ${\text{SO}}_2$ to ${\text{SO}}_3$ during the preparation of ${\text{H}}_2{\text{SO}}_4$. Thus, A matches with III.

Finely divided $\text{Fe}$ is used as a catalyst in the Haber process for the preparation of ammonia from ${\text{N}}_2$ and ${\text{H}}_2$ mixture. Thus, B matches with I.

${\text{PdCl}}_2$ is used as a catalyst in the Wacker process for the oxidation of ethene (referred to as ethyne in the given options) to ethanal. Thus, C matches with IV.

$\text{Ni}$ complexes are used as catalysts for the polymerisation of alkynes (e.g., polymerisation of ethyne to cyclooctatetraene). Thus, D matches with II.

The correct matching is A-III, B-I, C-IV, D-II.

Answer: A-III, B-I, C-IV, D-II