10 questionsð¬ð§English
𧪠Acids, Alkalis & pH â Year 7
Chemistry · Year 7 (KS3) â practise the pH scale, indicator colours and neutralisation reactions
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Questions
What is the pH of a neutral solution, such as pure water?
7
14
0
1
20s
What colour does blue litmus paper turn when it is dipped into an acid?
Green
Purple
It stays blue
Red
20s
Which of these everyday substances is an acid?
Oven cleaner
Soap
Toothpaste
Lemon juice
20s
Which of these pH values shows the most acidic solution?
pH 12
pH 6
pH 2
pH 7
20s
Universal indicator is added to sodium hydroxide solution with a pH of 14. What colour does it turn?
Red
Purple
Green
Yellow
30s
When an acid reacts with an alkali, what is produced?
Carbon dioxide only
An acid and water
A salt and hydrogen
A salt and water
30s
Indigestion is caused by too much acid in the stomach. What type of substance do indigestion tablets contain?
An indicator
A neutral salt
An acid
A base
30s
Which hazard symbol would you expect on a bottle of concentrated hydrochloric acid?
Flammable
Corrosive
Explosive
Oxidising
30s
Water is slowly added to an acid with a pH of 3. What happens to its pH as it becomes more dilute?
It rises towards 7
It stays at 3
It rises above 7
It falls towards 0
30s
Hydrochloric acid is neutralised by sodium hydroxide. Which salt is formed?
Sodium sulfate
Sodium nitrate
Hydrogen chloride
Sodium chloride
30s