MEDIUM
7th CBSE
IMPORTANT
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What colour does the phenolphthalein indicator turn when added to the base?

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Important Questions on Acids, Bases and Salts

MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 5 - Acids, Bases and Salts>Very Short Answer Type Questions>Q 4
What colour does the turmeric paper indicator turn when added to the base?
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 5 - Acids, Bases and Salts>Very Short Answer Type Questions>Q 5
Name one indicator which turns red on adding an acid.
EASY
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 5 - Acids, Bases and Salts>Very Short Answer Type Questions>Q 5
Name one indicator which turns red on adding a base.
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 5 - Acids, Bases and Salts>Very Short Answer Type Questions>Q 6
Nitric acid turns red litmus blue.
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 5 - Acids, Bases and Salts>Very Short Answer Type Questions>Q 6
Sodium hydroxide turns blue litmus red.
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 5 - Acids, Bases and Salts>Very Short Answer Type Questions>Q 6
Tooth decay is caused by the presence of a base.
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 5 - Acids, Bases and Salts>Very Short Answer Type Questions>Q 6

Change of colour in an acid or a base depends on the type of indicator used.

MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 5 - Acids, Bases and Salts>Very Short Answer Type Questions>Q 6
The indicator is a substance that shows different colours in acidic and basic solutions.