Lesson T5.1.1

T5.1.1 Acids, alkalis and neutralisation Quiz: KS3 Chemistry, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T5.1.1, Acids, alkalis and neutralisation: 20 multiple choice questions for the KS3 Chemistry (National Curriculum), Unit 5: Acids and alkalis, written with Revision Ninja.

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The 20 questions

  1. What is an acid, in terms of ions?

    • A substance that produces oxygen gas in water
    • A substance that removes all hydrogen from water
    • A substance that produces hydrogen ions (H+) in water
    • A substance that produces hydroxide ions (OH-) in water

  2. What is an alkali?

    • A solid that cannot dissolve in water
    • A gas that is only found in air
    • A soluble acid that produces hydrogen ions in water
    • A soluble base that produces hydroxide ions (OH-) in water

  3. What is a neutralisation reaction?

    • A reaction that heats an acid until it evaporates and leaves a solid residue
    • A reaction between two alkalis that forms a metal and oxygen in the mixture
    • A reaction between two acids that forms a gas and a small amount of water
    • A reaction between an acid and an alkali or base that forms a salt and water

  4. Which products are formed when an acid reacts with an alkali?

    • A salt and water
    • A metal and oxygen
    • A salt and hydrogen
    • A gas and an acid

  5. What is the term for a solution that is neither acidic nor alkaline?

    • Neutral
    • Basic
    • Soluble
    • Corrosive

  6. Which of these is an acid?

    • Sodium hydroxide solution
    • Bleach
    • Lemon juice
    • Soapy water

  7. Which of these is an alkali?

    • Dilute ethanoic acid (vinegar)
    • Citric acid in lemon juice
    • Hydrochloric acid solution
    • Sodium hydroxide solution

  8. What is a salt in chemistry?

    • A pure element found dissolved in sea water and in many other natural brines
    • A gas released when an acid reacts with water in the beaker and is collected
    • A compound made when the hydrogen in an acid is replaced by a metal or another positive ion
    • A liquid that dissolves almost every metal it touches in a dilute solution

  9. A student adds dilute hydrochloric acid to sodium hydroxide solution until it is neutral. What is formed?

    • Sodium hydrogencarbonate only
    • Sodium oxide and chlorine gas
    • Sodium chloride solution and water
    • Sodium chloride and hydrogen gas

  10. An acid is neutralised by an alkali, and the mixture is tested with universal indicator. What colour shows it is neutral?

    • Orange
    • Purple
    • Red
    • Green

  11. Which ion is common to all acids?

    • Na+ (sodium ion)
    • O2- (oxide ion)
    • H+ (hydrogen ion)
    • OH- (hydroxide ion)

  12. Which ion is common to all alkalis?

    • Cl- (chloride ion)
    • Na+ (sodium ion)
    • OH- (hydroxide ion)
    • H+ (hydrogen ion)

  13. Why are alkalis such as lime added to acidic soil?

    • They release hydrogen gas to dry out the soil
    • They dissolve the soil so that it can be removed
    • They make the soil more acidic for acid-loving plants
    • They neutralise the acid, so the soil becomes less acidic

  14. Why does an acid react with a metal oxide in neutralisation?

    • The metal oxide is a salt and reacts with the acid to form oxygen
    • The metal oxide is an acid, and reacts with the acid to form hydrogen
    • The metal oxide is a gas, and it dissolves into the acid
    • The metal oxide is a base, and reacts with the acid to form a salt and water

  15. What do you call a base that dissolves in water?

    • A neutral solution
    • A salt
    • An alkali
    • An acid

  16. Which pair would neutralise each other to form a salt and water?

    • Hydrochloric acid and sulfuric acid
    • Hydrochloric acid and sodium hydroxide
    • Sodium chloride and water
    • Sodium hydroxide and potassium hydroxide

  17. Why is a neutralisation reaction described as exothermic?

    • No energy is involved in neutralisation
    • Heat energy is turned into light as they react
    • Heat energy is released when the acid and alkali react
    • Heat energy is absorbed from the surroundings as they react

  18. A student adds sodium hydroxide to a solution and it turns blue with universal indicator. What does this show?

    • The solution is alkaline
    • The solution contains only salt
    • The solution is strongly acidic
    • The solution is neutral

  19. Why does dilute acid turn litmus paper red?

    • The acid dissolves the paper and leaves a red stain
    • The acid contains hydroxide ions that react with the paper
    • The acid heats the paper until it burns red
    • Hydrogen ions in the acid cause the indicator to change colour

  20. Which statement about neutralisation is correct?

    • The products of neutralisation are always a gas and an acid
    • The products of neutralisation never include water
    • The products of a neutralisation are always a salt and water
    • The products of neutralisation are always a metal and oxygen

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