Lesson T5.1.2
T5.1.2 The pH scale and indicators Quiz: KS3 Chemistry, Unit 5
20 questions
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Lesson T5.1.2, The pH scale and indicators: 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
-
What does the pH scale measure?
- Electrical conductivity
- Concentration of salt
- Temperature
- Acidity or alkalinity
-
What is the pH of a neutral solution at 25 °C?
- 7
- 14
- 0
- 1
-
Which pH value shows a strongly acidic solution?
- 13
- 1
- 10
- 7
-
Which pH value shows an alkaline solution?
- 3
- 7
- 5
- 11
-
Which indicator is red in acid and blue in alkali?
- Phenolphthalein
- Universal indicator
- Methyl orange
- Litmus
-
What colour is phenolphthalein in an alkali?
- Yellow
- Green
- Colourless
- Pink
-
Which natural substance can be used as an indicator?
- Red cabbage juice
- Distilled water
- Sugar syrup
- Tap water
-
What does universal indicator show about a solution?
- Density
- Temperature
- Pressure
- pH value
-
Which solution is a stronger acid: pH 3 or pH 5?
- They are equal
- pH 5
- Neither is acidic
- pH 3
-
A lemon juice turns universal indicator red. What is its approximate pH?
- About 2
- About 7
- About 11
- About 14
-
What is a chemical indicator?
- Neutralising salt
- Temperature sensor
- Colour-changing substance
- Strong acid
-
Why does a higher pH mean a more alkaline solution?
- More water molecules
- Fewer hydrogen ions
- More hydrogen ions
- Higher temperature
-
Which pH would a solution of sodium hydroxide most likely have?
- 5
- 7
- 13
- 2
-
Which pH would a solution of vinegar most likely have?
- 12
- 10
- 7
- 3
-
What causes pH paper to change colour?
- Dissolving salt
- Melting of paper
- Reaction with ions
- Evaporation of water
-
What happens to hydrogen ions when a pH falls from 9 to 4?
- They increase
- They decrease
- They disappear
- They stay the same
-
Why does adding an alkali to an acid make the pH rise?
- Adds hydrogen ions
- Lowers the temperature
- Removes hydrogen ions
- Creates more acid
-
A student tests a mixture with universal indicator and it turns orange. Which pH is most likely?
- About 13
- About 7
- About 10
- About 3 to 4
-
What colour does litmus paper turn in a strongly alkaline solution?
- Blue
- Green
- Colourless
- Red
-
What colour does methyl orange turn in a strongly acidic solution?
- Blue
- Green
- Red
- Yellow
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