MEDIUM
7th CBSE
IMPORTANT
Earn 100

Tooth decay is caused by the presence of a base.

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Important Questions on Acids, Bases and Salts

MEDIUM
7th CBSE
IMPORTANT

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

MEDIUM
7th CBSE
IMPORTANT
The indicator is a substance that shows different colours in acidic and basic solutions.
MEDIUM
7th CBSE
IMPORTANT
What can you say about the nature of a solution which turns blue litmus red? (Basic/ Acidic)
MEDIUM
7th CBSE
IMPORTANT
Ammonia is found in many household products such as window cleaners. It turns red litmus blue. What is its nature? (Acidic/ Basic)
EASY
7th CBSE
IMPORTANT
Name any two gaseous pollutants which cause acid rain.
EASY
7th CBSE
IMPORTANT
Name two strong acids and two weak acids.
MEDIUM
7th CBSE
IMPORTANT
Name two strong bases and two weak bases.