Lesson T5.2.2

T5.2.2 Acids reacting with alkalis Quiz: KS3 Chemistry, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson T5.2.2, Acids reacting with alkalis: 20 multiple choice questions for the KS3 Chemistry (National Curriculum), Unit 5: Acids and alkalis, 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 is produced when an acid reacts with an alkali?

    • A salt and water
    • A salt and hydrogen gas
    • A metal and oxygen
    • Only water and carbon dioxide

  2. What is the pH of a neutral solution at room temperature?

    • 7
    • 14
    • 10
    • 1

  3. What do acids have in common in their pH values?

    • They have pH values above 14
    • They have pH values exactly equal to 7
    • They have pH values above 7
    • They have pH values below 7

  4. Which indicator turns red in acid and blue in alkali?

    • Limewater
    • Litmus
    • Phenolphthalein only
    • Universal indicator

  5. Which name is given to a soluble base?

    • A catalyst
    • A salt
    • An oxide
    • An alkali

  6. Hydrochloric acid reacts with sodium hydroxide. Which salt is formed?

    • Sodium carbonate
    • Sodium nitrate
    • Sodium chloride
    • Sodium sulfate

  7. What is the word equation for the reaction of sulfuric acid with potassium hydroxide?

    • Sulfuric acid + potassium hydroxide gives potassium chloride + carbon dioxide
    • Sulfuric acid + potassium hydroxide gives potassium sulfate + water
    • Sulfuric acid + potassium hydroxide gives potassium sulfate + hydrogen
    • Sulfuric acid + potassium hydroxide gives potassium oxide + oxygen

  8. A student adds an alkali to an acid until the solution is neutral. What is the pH of the final solution?

    • 0
    • 14
    • 1
    • 7

  9. Which apparatus is used to find the pH of a solution accurately?

    • A thermometer placed in the mixture to read its temperature change
    • Limewater, which goes cloudy in the presence of acid
    • Universal indicator with a colour chart
    • A lit splint held in the tube, which pops with a squeaky sound

  10. Which statement describes a neutralisation reaction?

    • An alkali decomposes to make an acid and oxygen, with no salt formed
    • A salt dissolves to make a solution with pH 14, so it is alkaline
    • An acid and a metal react to make hydrogen and a salt, with bubbles
    • An acid and an alkali react so that the acidity and alkalinity cancel out

  11. When a little alkali is added to a dilute acid, the pH value:

    • Decreases towards 0
    • Stays exactly the same
    • Jumps straight to 14
    • Increases towards 7

  12. In a titration, a colour change shows that the acid and alkali are:

    • Both made into gases
    • Completely dissolved in water
    • Turned into metal salts
    • Exactly neutralised

  13. Which ion is responsible for the acidic properties of an acid solution?

    • Hydrogen ions
    • Hydroxide ions
    • Nitrate ions
    • Chloride ions

  14. Which ion is responsible for the alkaline properties of an alkali solution?

    • Hydrogen ions
    • Hydroxide ions
    • Carbonate ions
    • Nitrate ions

  15. A student's solution has pH 11. Which statement is correct?

    • The solution contains only water
    • The solution is neutral
    • The solution is alkaline
    • The solution is acidic

  16. Which pair correctly matches an acid with the salt it forms when reacted with an alkali?

    • Nitric acid with sodium hydroxide makes sodium carbonate
    • Nitric acid with sodium hydroxide makes sodium sulfate
    • Nitric acid with sodium hydroxide makes sodium nitrate
    • Nitric acid with sodium hydroxide makes sodium chloride

  17. Which statement about the reaction of an acid with a carbonate is correct?

    • It forms a salt, water and carbon dioxide gas
    • It forms oxygen and a metal, which bubble off the solution
    • It forms a salt and hydrogen gas only, with no water
    • It forms only a salt and no gas, so nothing bubbles away

  18. Which indicator is most useful for showing when an acid is just neutralised by an alkali?

    • Hydrogen gas, which burns with a squeaky pop at the end point
    • Phenolphthalein, which changes from pink to colourless at the end point
    • Limewater, which goes cloudy at the end point of the reaction
    • Phenolphthalein, which stays pink throughout the whole reaction time

  19. Which of these substances is an alkali?

    • Sodium chloride
    • Sodium hydroxide
    • Hydrochloric acid
    • Sulfuric acid

  20. What colour does universal indicator turn in a neutral solution?

    • Green
    • Red
    • Purple
    • Orange

All KS3 Chemistry quizzes