Lesson 4.3.4

4.3.4 Using concentrations of solutions in mol/dm3 (chemistry only) Quiz: AQA Chemistry, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.3.4, Using concentrations of solutions in mol/dm3 (chemistry only): 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 3: Quantitative chemistry, written with Revision Ninja.

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The 20 questions

  1. What are the standard SI units for solution concentration?

    • mol/cm3
    • mol/dm3
    • g/dm3
    • g/cm3

  2. How many moles of solute are in 0.5 dm3 of a 2 mol/dm3 solution?

    • 2.5 mol
    • 1 mol
    • 4 mol
    • 0.25 mol

  3. What is the concentration of 0.1 mol of solute in 250 cm3?

    • 4 mol/dm3
    • 0.1 mol/dm3
    • 0.025 mol/dm3
    • 0.4 mol/dm3

  4. 20 cm3 of NaOH at 0.2 mol/dm3 is neutralised by 25 cm3 of HCl (1 : 1). What is the HCl concentration?

    • 0.2 mol/dm3
    • 0.25 mol/dm3
    • 0.125 mol/dm3
    • 0.16 mol/dm3

  5. What is the mass of NaCl in 2 dm3 of 0.5 mol/dm3 solution? (NaCl = 58.5)

    • 117 g
    • 29.25 g
    • 1 g
    • 58.5 g

  6. How many moles of NaOH are in 0.5 dm3 of 0.4 mol/dm3 solution?

    • 0.8 mol
    • 0.4 mol
    • 0.2 mol
    • 0.02 mol

  7. How is concentration in mol/dm3 calculated from moles and volume?

    • Moles divided by volume
    • Volume divided by moles
    • Moles times volume
    • Moles plus volume

  8. 20 cm3 of 0.1 mol/dm3 HCl is neutralised by 25 cm3 of NaOH (1 : 1). What is the NaOH concentration?

    • 0.08 mol/dm3
    • 0.05 mol/dm3
    • 0.8 mol/dm3
    • 0.125 mol/dm3

  9. H2SO4 (0.1 mol/dm3) reacts with NaOH (0.2 mol/dm3) in a 1 : 2 ratio. What volume of NaOH neutralises 25 cm3 of H2SO4?

    • 50 cm3
    • 25 cm3
    • 100 cm3
    • 12.5 cm3

  10. What is the concentration of 4 g of NaOH (Mr = 40) in 500 cm3?

    • 0.4 mol/dm3
    • 2 mol/dm3
    • 0.2 mol/dm3
    • 0.1 mol/dm3

  11. What is the concentration of 5.85 g of NaCl (Mr = 58.5) dissolved to 250 cm3?

    • 0.04 mol/dm3
    • 1 mol/dm3
    • 0.4 mol/dm3
    • 0.1 mol/dm3

  12. How many moles of HCl are in 20 cm3 of 0.5 mol/dm3 solution?

    • 0.5 mol
    • 0.001 mol
    • 0.1 mol
    • 0.01 mol

  13. What volume in cubic centimetres is equal to one cubic decimetre?

    • 100 cm3
    • 1000 cm3
    • 10 cm3
    • 10000 cm3

  14. How many moles of HCl are in 100 cm3 of 2 mol/dm3 solution?

    • 0.2 mol
    • 20 mol
    • 2 mol
    • 0.02 mol

  15. 20 cm3 of 0.1 mol/dm3 HCl neutralises 25 cm3 of NaOH (1 : 1). What is the NaOH concentration?

    • 0.1 mol/dm3
    • 0.08 mol/dm3
    • 0.125 mol/dm3
    • 0.8 mol/dm3

  16. What is the mass of KOH (Mr = 56) in 200 cm3 of 0.5 mol/dm3 solution?

    • 2.8 g
    • 56 g
    • 5.6 g
    • 11.2 g

  17. Why is using mol/dm3 useful when comparing reacting solutions?

    • Direct mole comparison
    • Ignores solution volume
    • Removes need for equations
    • Always equals mass

  18. A reacts with B in a 1 : 2 mole ratio. A is 0.5 mol/dm3 in 25 cm3, and B is 0.25 mol/dm3. What volume of B reacts completely?

    • 50 cm3
    • 25 cm3
    • 100 cm3
    • 12.5 cm3

  19. Solution concentration is 0.2 mol in 1 dm3, then diluted to 2 dm3. What is the new concentration?

    • 0.4 mol/dm3
    • 0.1 mol/dm3
    • 0.05 mol/dm3
    • 0.2 mol/dm3

  20. What is the concentration of 0.3 mol of HCl in 1.5 dm3 of solution?

    • 0.5 mol/dm3
    • 0.02 mol/dm3
    • 0.2 mol/dm3
    • 0.45 mol/dm3

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