Question

When conc. $H_2SO_4$ is heated with $P_2 O_5$, the acid is converted into

• A. sulphur
• B. sulphur dioxide
• C. sulphur trioxide
• D. a mixture of sulphur dioxide and sulphur trioxide

Answer 1

Answer: (C)

sulphur trioxide

Answer 2

When cone. ${H_2SO_4}$ is heated with ${P_2O_5}$, the acid is converted into sulphur trioxide.

{2H_2SO_4 + 2P_2O_5 -> \underset{\text{ sulphur trioxide}}{{ 2SO_3 }} + 4HPO_3}