Question

Which of the following is the rate-determining step of the idustrial preparation of sulphuric acid?

• A. Formation of $S{O}_2$
• B. Formation of $S{O}_3$
• C. Formation of oleum
• D. Dilutiion of oleum

Answer 1

The correct option is B

Formation of $S{O}_3$

The oxidation of $S{O}_2$ to $S{O}_3$ is a reversible process and hence very slow. So it is the rate determining step in the manufacture of sulphuric acid as it bottlenecks the speed of the entire process