A-LevelChemistryEquilibria9701/12 · Feb/Mar 2017 · Q341 Mark
Sulfur dioxide and oxygen react in the gas phase. 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) ∆H = –197 kJ mol⁻¹ Which statements are correct? 1 Increasing the pressure increases the equilibrium yield of SO₃. 2 Increasing the temperature lowers the value of the equilibrium constant Kp. 3 The presence of a vanadium(V) oxide catalyst increases the equilibrium yield of SO₃.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct answer
B: 1 and 2 only are correct
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