alleryFor the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), at equilibrium increasing pressure:
ANo effect
BShifts forward (3 → 2 moles)
CDecomposes SO3
DShifts backward
Answer & Solution
Correct answer: B. Shifts forward (3 → 2 moles)
Reactants have 3 mol gas (2 SO2 + 1 O2), products 2 mol (2 SO3).
Increasing pressure favours fewer moles, shifts forward toward SO3. This is the contact process for sulphuric acid.
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