Question

Which of the following elements can be used as a catalyst in the second stage of contact process?

• A. Platinum
• B. Vanadium pentoxide
• C. Palladium
• D. Rhodium

Answer 1

Answer: (A), (B)

The correct options are
A Platinum
B Vanadium pentoxide

The second stage of the contact process involves oxidation of Sulphur dioxide($S{O}_2$) to Sulphur trioxide($S{O}_3$). Since this is a very slow process, the gases are passed through granulated catalyst such as platinum or vanadium pentoxide at a temperature of ${450}^{o}C$.