Question

In the preparation of sulphuric acid, ${{V}_{2}}{{O}_{5}}$ is used in the reaction which is

• A. $S + O _{2} \rightarrow SO _{2}$
• B. $SO _{2}+ H _{2} O \rightarrow H _{2} SO _{4}$
• C. $2 SO _{2}+ O _{2} \rightarrow 2 SO _{3}$
• D. None of these

Answer 1

Answer: (C)

$2 SO _{2}+ O _{2} \rightarrow 2 SO _{3}$

Answer 2

In contact process of manufacture of $H _{2} SO _{4}$ first of all $SO _{2}$ is oxidised to $SO _{3}$ by atmospheric oxygen in presence of $V _{2} O _{5}$ as a catalyst. $2SO_2 + O_2 {->[V_2O_5]} 2SO_3$