CAIE IGCSE Chemistry: Contact Process Equation Question Bank

Practise identifying the Contact process and writing the reversible equation for oxidising sulfur dioxide to sulfur trioxide.

Exam points

write 2SO2 + O2 ⇌ 2SO3 with correct balancing and a reversible arrow
identify the vanadium(V) oxide-catalysed step in the Contact process from reaction lists
link sulfuric acid manufacture to the Contact process without confusing it with Haber

[Maximum number: 2]

Sulfur is an important element.

Sulfuric acid is manufactured by the Contact process. One step in the Contact process involves a reversible reaction in which sulfur trioxide, $\mathrm{SO}_{3}$ , is formed.

Write a chemical equation for this reversible reaction. Include the correct symbol to show that the reaction is reversible.

$2 \mathrm{SO}_{2}+\mathrm{O}_{2} \rightleftharpoons 2 \mathrm{SO}_{3}$

M1 Balanced equation

M2 reversible arrow

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6.3.8—Symbol equation for the conversion of question 1