Lesson 3.3.11.2

3.3.11.2 Base properties Quiz: AQA Chemistry, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson 3.3.11.2, Base properties: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.

Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.

Host this setFree Play

The 20 questions

  1. What property of amines makes them act as bases?

    • The C-N bond can donate a pair of electrons to carbon
    • The lone pair of electrons on nitrogen can accept a proton
    • They have a negative charge on nitrogen
    • They contain a delocalised pi system

  2. Which amine is the strongest base in the specification comparison?

    • Phenylamine
    • Benzene-1,3-diamine
    • Ammonia
    • Ethylamine

  3. Why is phenylamine a weaker base than ethylamine?

    • The lone pair on nitrogen is delocalised into the benzene ring, so it is less available to accept a proton
    • The benzene ring removes all lone pairs from nitrogen, so no protonation can happen
    • Phenylamine contains more hydrogen atoms per molecule, which makes it less basic overall
    • Phenylamine is a stronger acid than ethylamine, so it donates protons more readily

  4. Why is ethylamine a stronger base than ammonia?

    • The ethyl group donates electron density to nitrogen, making its lone pair more available
    • Ethylamine contains a carbon-carbon double bond that accepts protons from the solution
    • The ethyl group removes electron density from nitrogen, making its lone pair less available
    • Ammonia contains no lone pair on nitrogen, so it cannot accept protons at all

  5. Which order lists the bases from strongest to weakest?

    • Propylamine > ammonia > phenylamine
    • Phenylamine > ammonia > propylamine
    • Ammonia > propylamine > phenylamine
    • Propylamine > phenylamine > ammonia

  6. Which species is formed when ammonia accepts a proton?

    • NH3+
    • NH2+
    • NH2-
    • NH4+

  7. What is the salt formed when methylamine reacts with hydrogen chloride?

    • Methylammonium nitrate, CH3NH3+ NO3-
    • Methylammonium chloride, CH3NH3+ Cl-
    • Methyl chloride, CH3Cl
    • Methanamide, HCONH2

  8. Which ion makes an aqueous solution of an amine alkaline?

    • Hydrogen carbonate ion, HCO3-
    • Hydrogen ion, H+
    • Hydroxide ion, OH-
    • Chloride ion, Cl-

  9. What is the relationship between pKb and base strength?

    • A higher pKb means a stronger base
    • pKb is unrelated to base strength
    • A higher pKb means a weaker base
    • pKb measures only the molar mass of a base

  10. Which amine has the lowest pKb value among ethylamine, ammonia and phenylamine?

    • Ammonia
    • Phenylamine
    • Ethylamine
    • All three have equal pKb values

  11. Which factor makes the lone pair of an amine more available for protonation?

    • Electron-donating alkyl groups
    • Replacement of N with a carbon atom
    • Delocalisation into a benzene ring
    • Strong electron withdrawal by a carbonyl group

  12. What is the product when phenylamine is protonated by a strong acid?

    • Phenol and hydrogen, formed when the amine is oxidised by the strong acid present
    • Nitrobenzene and water, formed when the amine is oxidised back to the nitro compound
    • The phenylammonium ion, C6H5NH3+
    • Benzene and ammonia, formed when the ring is protonated and loses its substituent

  13. What is the conjugate acid of ethylamine?

    • CH3CH2NH4+
    • CH3CH2NH3+
    • CH3CH2NH-
    • CH3CH2NH2+

  14. Which statement describes an amine as a Bronsted-Lowry base?

    • It accepts a proton
    • It donates a proton
    • It releases hydroxide ions in its own structure
    • It accepts an electron pair from a carbon atom

  15. Which solution would have the higher pH: 0.1 mol dm-3 ethylamine or 0.1 mol dm-3 phenylamine?

    • Phenylamine
    • Neither solution is basic
    • Ethylamine
    • They would have the same pH

  16. Which species is the conjugate base of CH3NH3+?

    • CH3NH2
    • CH3NH4
    • CH3NH-
    • CH3NH3-

  17. Which of these is the stronger base: cyclohexylamine or phenylamine?

    • Phenylamine
    • They are equally basic
    • Cyclohexylamine
    • Neither is a base

  18. What mass of HCl is needed to neutralise 0.05 mol of ethylamine?

    • 0.91 g
    • 1.83 g
    • 0.18 g
    • 3.65 g

  19. Which conjugate acid is the strongest acid?

    • Methylammonium ion, CH3NH3+
    • Ethylammonium ion, CH3CH2NH3+
    • Ammonium ion, NH4+
    • Phenylammonium ion, C6H5NH3+

  20. Which description best defines a weak base?

    • It is a salt that contains no lone pair, so it cannot accept any protons at all
    • It is a metal hydroxide that dissolves fully to give a high concentration of OH-
    • It is only partially protonated when it dissolves in water
    • It is completely protonated in water, so it gives a strong alkaline solution

All AQA Chemistry quizzes