Question

Which one of the following forms oleum when dissolved in cone ${H_2SO_4}$ ?

• A. Sulphur dioxide
• B. Sulphur trioxide
• C. Sulphuryl chloride
• D. thionyl chloride

Answer 1

Answer: (B)

Sulphur trioxide

Answer 2

{SO3 + H2SO4 ->\underset{\text{(Oleum)}}{ {H_2S2O7}} }