Lesson 4.6.2.7

4.6.2.7 The effect of pressure changes on equilibrium (HT only) Quiz: AQA Chemistry, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.6.2.7, The effect of pressure changes on equilibrium (HT only): 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 6: The rate and extent of chemical change, written with Revision Ninja.

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The 20 questions

  1. When pressure is increased on a gaseous equilibrium, which side is favoured?

    • Fewer molecules
    • Product side
    • No change
    • More molecules

  2. When pressure is decreased on a gaseous equilibrium, which side is favoured?

    • More molecules
    • Reactant side
    • Fewer molecules
    • No change

  3. What must be compared to predict the effect of pressure on a gaseous equilibrium?

    • Reaction rates
    • Temperature values
    • Molecule numbers
    • Activation energies

  4. Pressure changes affect equilibrium positions only when the equilibrium involves which substances?

    • Liquids only
    • Gases
    • Solids only
    • Aqueous ions only

  5. Pressure changes have no effect on equilibria with which feature?

    • Maximum catalysts
    • Equal concentrations
    • Exothermic enthalpy
    • Equal gas molecules

  6. In N2 + 3H2 ⇌ 2NH3, which side has fewer gas molecules?

    • Neither side
    • Products
    • Reactants
    • Both sides

  7. What is equal when a reversible reaction reaches dynamic equilibrium?

    • Pressures
    • Concentrations
    • Reaction rates
    • Masses

  8. In a reversible reaction, what does the equilibrium position describe?

    • Catalyst mass
    • Activation energy
    • Reaction speed
    • Relative amounts

  9. For N2 + 3H2 ⇌ 2NH3, which change increases the ammonia yield?

    • Lower temperature
    • Removing catalyst
    • Higher pressure
    • Lower pressure

  10. For 2SO2 + O2 ⇌ 2SO3, the equilibrium mixture is compressed. Which direction does it shift?

    • Towards solid products
    • Towards SO2 and O2
    • No shift
    • Towards SO3

  11. For H2 + I2 ⇌ 2HI with all gases, what happens when pressure increases?

    • Shift to reactants
    • Shift to products
    • No change
    • Rate decreases

  12. For CaCO3(s) ⇌ CaO(s) + CO2(g), what happens when pressure increases?

    • Shifts left
    • Rate stops
    • No change
    • Shifts right

  13. For PCl5 ⇌ PCl3 + Cl2, all gases, what happens when pressure decreases?

    • Yield drops
    • Shifts right
    • No change
    • Shifts left

  14. Why is the statement 'increasing pressure always shifts equilibrium towards products' incorrect?

    • Products are always solids
    • Equilibrium cannot shift
    • Pressure only affects liquids
    • Depends on gas molecules

  15. For 2NO + O2 ⇌ 2NO2, which side of the equation has more gas molecules?

    • Right side
    • Both sides
    • Neither side
    • Left side

  16. Which type of equilibrium shifts most towards products when pressure rises?

    • 3 moles to 3
    • 2 moles to 2
    • 2 moles to 1
    • 1 mole to 2

  17. For A(g) + 2B(g) ⇌ C(g) + D(g), the volume is halved so the pressure doubles. Which direction does the equilibrium move?

    • Towards C and D
    • Only solids move
    • No change
    • Towards A and B

  18. For N2O4(g) ⇌ 2NO2(g), which condition maximises the amount of N2O4?

    • Low concentration
    • Low pressure
    • High pressure
    • High temperature

  19. What happens to a gaseous equilibrium with equal molecule counts when pressure increases?

    • Shift right
    • Rate doubles
    • Shift left
    • No change

  20. For 3A(g) ⇌ 2B(g) + C(s), which pressure change moves the equilibrium towards B?

    • Decreasing the pressure
    • Adding more solid C
    • Adding a catalyst
    • Increasing the pressure

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