Question

When conc. $H _{2} SO _{4}$ is heated with $P _{2} O _{5}$, the acid is converted into

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

Answer 1

Answer: (A)

sulphur trioxide

Answer 2

When conc. $H _{2} SO _{4}$ is heated with $P _{2} O _{5}$, the ac is converted into sulphur trioxide. $2 H _{2} SO _{4}+2 P _{2} O _{5} \longrightarrow \underset{\text { sulphur trioxide }}{2 SO _{3}}+4 HPO_3$