Lesson 2.1.4

2.1.4 Acids Quiz: OCR Chemistry, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 2.1.4, Acids: 20 multiple choice questions for the OCR Chemistry (H432), Unit 1: Foundations in chemistry, written with Revision Ninja.

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The 20 questions

  1. What is the formula of ethanoic acid?

    • CH3CH2OH
    • HCOOCH3
    • H2SO4
    • CH3COOH

  2. What ions do acids release in aqueous solution?

    • CO3 2- ions
    • H+ ions
    • Na+ ions
    • OH- ions

  3. What type of solute is ammonia when dissolved in water?

    • Strong acid
    • Weak acid
    • Strong alkali
    • Weak alkali

  4. Why is ethanoic acid classified as a weak acid in aqueous solution?

    • Partially dissociates
    • High concentration
    • Does not dissociate
    • Fully dissociates

  5. What is the net ionic equation for neutralisation of any strong acid with any strong alkali?

    • H+(aq) + Cl-(aq) → HCl(aq)
    • H+(aq) + OH-(aq) → H2O(l)
    • Na+(aq) + OH-(aq) → NaOH(s)
    • H2(g) + O2-(aq) → H2O(l)

  6. Which gas is produced when calcium carbonate reacts with hydrochloric acid?

    • Oxygen
    • Hydrogen
    • Carbon dioxide
    • Chlorine

  7. What salt is formed when sulfuric acid neutralises copper(II) oxide?

    • copper(I) sulfate
    • copper sulfide
    • copper(II) sulfate
    • copper(II) sulfite

  8. What volume of 0.0500 mol dm-3 H2SO4 is needed to neutralise 25.0 cm3 of 0.100 mol dm-3 NaOH?

    • 25.0 cm3
    • 12.5 cm3
    • 5.00 cm3
    • 50.0 cm3

  9. What mass of anhydrous sodium carbonate (Mr = 106.0) is needed to make 250 cm3 of a 0.100 mol dm-3 solution?

    • 0.265 g
    • 10.6 g
    • 26.5 g
    • 2.65 g

  10. 20.0 cm3 of 0.0500 mol dm-3 Na2CO3 is neutralised by 25.0 cm3 of HCl. What is the concentration of the HCl?

    • 0.160 mol dm-3
    • 0.0400 mol dm-3
    • 0.0800 mol dm-3
    • 0.0500 mol dm-3

  11. What mass of MgO (Mr = 40.3) reacts with 50.0 cm3 of 1.00 mol dm-3 HNO3?

    • 4.03 g
    • 2.02 g
    • 0.501 g
    • 1.01 g

  12. Which indicator is most suitable for titrating ethanoic acid with sodium hydroxide solution?

    • methyl red
    • methyl orange
    • bromothymol blue
    • phenolphthalein

  13. How many moles are in 25.0 cm3 of 0.200 mol dm-3 ethanoic acid?

    • 0.00500 mol
    • 0.200 mol
    • 0.00800 mol
    • 0.0200 mol

  14. 20.0 cm3 of NaOH is titrated with 0.100 mol dm-3 HCl, and 18.5 cm3 is needed. What is the concentration of the NaOH?

    • 0.0370 mol dm-3
    • 0.185 mol dm-3
    • 0.0925 mol dm-3
    • 0.0500 mol dm-3

  15. Which salt is produced when ethanoic acid reacts with sodium hydroxide?

    • Sodium ethanoate
    • Sodium carbonate
    • Sodium sulfate
    • Sodium methanoate

  16. A 0.252 g sample of a dibasic acid, H2X, is neutralised by 20.0 cm3 of 0.200 mol dm-3 NaOH. What is the Mr of the acid?

    • 126
    • 252
    • 63.0
    • 504

  17. Which species is released into aqueous solution by all acids?

    • Na+ ions
    • H+ ions
    • OH– ions
    • O2– ions

  18. How many moles of H+ ions are in 50.0 cm3 of 0.0200 mol dm-3 H2SO4?

    • 0.0200 mol
    • 0.00400 mol
    • 0.00200 mol
    • 0.00100 mol

  19. What volume of 0.100 mol dm-3 HCl is needed to neutralise 0.400 g of NaOH? (Mr = 40.0)

    • 100 cm3
    • 200 cm3
    • 40.0 cm3
    • 10.0 cm3

  20. 10.0 g of CaCO3 (Mr = 100) is added to 100 cm3 of 0.500 mol dm-3 HCl. How many moles of CO2 are produced?

    • 0.0125 mol
    • 0.0250 mol
    • 0.100 mol
    • 0.0500 mol

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