Lesson 3.2.5.6

3.2.5.6 Catalysts Quiz: AQA Chemistry, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.2.5.6, Catalysts: 20 multiple choice questions for the AQA Chemistry (7405), Unit 2: Inorganic chemistry, written with Revision Ninja.

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The 20 questions

  1. What defines a heterogeneous catalyst in a chemical reaction?

    • Solid phase only
    • Same physical phase
    • Different physical phase
    • Liquid phase only

  2. What defines a homogeneous catalyst in a chemical reaction?

    • Insoluble phase
    • Same physical phase
    • Solid phase only
    • Different physical phase

  3. Where do reactions take place on a heterogeneous catalyst?

    • Bulk surface
    • Phase boundaries
    • Pore interiors
    • Active sites

  4. What is the main reason for using a catalyst support medium?

    • Maximise surface area
    • Lower reaction enthalpy
    • Prevent catalyst oxidation
    • Increase kinetic energy

  5. Which catalyst is used in the Contact process?

    • Mn2+
    • Fe
    • Pt only
    • V2O5

  6. Which catalyst is used as a heterogeneous catalyst in the Haber process?

    • Copper(II) ions
    • Vanadium(V) oxide
    • Manganese(II) ions
    • Iron

  7. What process reduces catalyst efficiency when impurities block active sites?

    • Ligand substitution
    • Autocatalysis
    • Catalyst poisoning
    • Thermal degradation

  8. Which equation shows the first step in the Contact process catalysed by V2O5?

    • 2SO2 + 2H2O -> 2H2SO3
    • SO2 + O2 -> SO3 only
    • V2O5 + H2O -> H2V2O6
    • SO2 + V2O5 -> SO3 + V2O4

  9. Which equation shows the regeneration of the V2O5 catalyst in the Contact process?

    • 2V2O5 + O2 -> 4VO2
    • V2O4 + 1/2 O2 -> V2O5
    • V2O5 -> V2O4 + O2
    • V2O4 + SO2 -> V2O5 + S

  10. Which species is reduced by Fe2+ in the catalysed peroxydisulfate-iodide reaction?

    • SO4 2-
    • S2O8 2-
    • I2
    • I-

  11. In the Fe2+ catalysed reaction of I- with S2O8^2-, what is the second step of the catalytic cycle?

    • Fe2+ + I2 -> FeI2 + e-
    • 2Fe3+ + 2I- -> 2Fe2+ + I2
    • I- + Fe3+ -> I2 + Fe only
    • 2Fe3+ + SO4^2- -> Fe2(SO4)3

  12. Why is the uncatalysed reaction between I- and S2O8 2- slow?

    • Endothermic enthalpy change
    • Low activation energy
    • Negative ion repulsion
    • Positive ion attraction

  13. Which transition metal property is essential for homogeneous catalysis?

    • Incomplete d-subshells
    • Low electrical conductivity
    • Variable oxidation states
    • High melting point

  14. What term describes a catalyst that is formed as a product of the reaction?

    • Homogeneous catalyst
    • Heterogeneous catalyst
    • Autocatalyst
    • Inhibitor

  15. Which ion autocatalyses the reaction between ethanedioate and acidified manganate(VII)?

    • Cl-
    • Mn2+
    • Na+
    • SO4^2-

  16. Which ion acts as the autocatalyst in the reaction between ethanedioate and manganate(VII)?

    • Mn7+
    • Mn2 setup
    • MnO4-
    • Fe2+

  17. What process occurs when reactant gases bind to the iron catalyst in the Haber process?

    • Dissolution
    • Absorption
    • Adsorption
    • Desorption

  18. What species is formed during a reaction involving a homogeneous catalyst?

    • Catalyst support
    • Heterogeneous phase
    • Reaction intermediate
    • Solid precipitate

  19. What role do transition metal ions play by changing oxidation state during catalysis?

    • Proton transfer
    • Neutron emission
    • Ligand displacement
    • Electron transfer

  20. How does adding a catalyst affect the forward and reverse reaction rates at equilibrium?

    • Decreases both equally
    • Increases forward only
    • Increases reverse only
    • Increases both equally

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