A-LevelChemistryEquilibria9701/12 · Feb/Mar 2024 · Q141 Mark
A mixture of hydrogen gas and iodine gas is placed in a reaction vessel of volume V at temperature T. The reaction H₂ + I₂ ⇌ 2HI is allowed to come to equilibrium. All substances remain in the gaseous state. Argon gas is then pumped into the reaction vessel. The temperature in the vessel is maintained at T. How are the rate of the forward reaction and the partial pressure of HI at equilibrium affected?
Arate of forward reaction: increased, partial pressure of HI at equilibrium: increased
Brate of forward reaction: increased, partial pressure of HI at equilibrium: unaffected
Crate of forward reaction: unaffected, partial pressure of HI at equilibrium: increased
Drate of forward reaction: unaffected, partial pressure of HI at equilibrium: unaffected
✓ Correct answer
D: rate of forward reaction: unaffected, partial pressure of HI at equilibrium: unaffected
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