CAIE IGCSE Chemistry 6.3.10 Typical Conditions for the Conversion Questions

Select the conditions for converting sulfur dioxide to sulfur trioxide and distinguish the vanadium(V) oxide catalyst from Haber-process conditions.

Exam points

state about 450 °C, 200 kPa or two atmospheres, and vanadium(V) oxide catalyst
write the reversible balanced equation 2SO2 + O2 ⇌ 2SO3
identify the catalyst stage and conditions for sulfur trioxide formation
include units and distinguish Contact-process conditions from Haber-process conditions

[Maximum number: 1]

Which row identifies the pressure and the catalyst used for the conversion of sulfur dioxide to sulfur trioxide in the Contact process?

pressure/atm

catalyst

iron

vanadium(V) oxide

200

iron

200

vanadium(V) oxide

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