Lesson 5.6.2.7

5.6.2.7 The effect of pressure changes on equilibrium (HT only) Quiz: AQA Combined Science, Unit 13

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 5.6.2.7, The effect of pressure changes on equilibrium (HT only): 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 13: The rate and extent of chemical change, written with Revision Ninja.

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The 20 questions

  1. Where does the position of a gaseous equilibrium shift when pressure is increased?

    • Fewer molecules
    • No shift
    • More molecules
    • Higher density

  2. Where does the position of a gaseous equilibrium shift when pressure is decreased?

    • Solid phase
    • No shift
    • Fewer molecules
    • More molecules

  3. Which type of equilibria are affected by changes in pressure?

    • Aqueous solutions
    • Pure solids
    • Gaseous reactions
    • Pure liquids

  4. For 2NO2 to N2O4, increasing pressure shifts the position towards:

    • NO2
    • Both sides equally
    • No shift
    • N2O4

  5. For N2 + 3H2 to 2NH3, increasing pressure favours:

    • NH3
    • The catalyst
    • Neither side
    • N2 and H2

  6. For N2 + 3H2 to 2NH3, decreasing pressure shifts the position towards:

    • NH3
    • No shift
    • N2 and H2
    • The catalyst

  7. For CaCO3 to CaO + CO2 (carbon dioxide gas), increasing pressure shifts towards:

    • CO2 only
    • CaO and CO2
    • CaCO3
    • No shift

  8. For PCl5 to PCl3 + Cl2, decreasing pressure shifts towards:

    • The catalyst
    • PCl5
    • PCl3 and Cl2
    • No shift

  9. For 2CO + O2 to 2CO2, increasing pressure shifts towards:

    • Both sides equally
    • CO and O2
    • No change
    • CO2

  10. Which equilibrium is unaffected by pressure changes?

    • N2 + 3H2 to 2NH3
    • 2SO2 + O2 to 2SO3
    • H2 + I2 to 2HI
    • N2O4 to 2NO2

  11. Increasing pressure in a gas equilibrium: the rate of attaining equilibrium:

    • Stops
    • Stays unchanged
    • Decreases
    • Increases

  12. For A(g) + 2B(g) to C(g), increasing pressure shifts towards:

    • Neither side
    • The catalyst
    • A and B
    • C

  13. For 2NO2 to N2O4, decreasing pressure shifts towards:

    • N2O4
    • A solid
    • NO2
    • No shift

  14. Which equilibrium reaction produces more product when the pressure is increased?

    • CO + H2O to CO2 + H2
    • H2 + I2 to 2HI
    • N2 + O2 to 2NO
    • 2SO2 + O2 to 2SO3

  15. An equilibrium has 4 gas molecules on the left and 2 on the right. Increasing pressure shifts position:

    • Randomly
    • To the right
    • To the left
    • No shift

  16. Adding an inert gas at constant volume to a gas equilibrium affects the position by:

    • Shifting left
    • No change
    • Stopping reaction
    • Shifting right

  17. Lowering pressure on the N2O4 to 2NO2 equilibrium mixture causes it to become:

    • More blue
    • More brown
    • Colourless
    • Dark purple

  18. Which molecular ratio means high pressure favours the right-hand side?

    • 1 left, 1 right
    • 3 left, 1 right
    • 2 left, 2 right
    • 1 left, 3 right

  19. High pressure on a gas equilibrium with an equal number of molecules on each side causes:

    • Shift right
    • No shift
    • Complete conversion
    • Shift left

  20. Why does high pressure increase equilibrium yield in the Haber process?

    • Equal molecules
    • Fewer product molecules
    • Increased temperature
    • More product molecules

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