CBSE Class 10 Science 2021 Term 1 Solved Paper

Question : 8

Total: 60

Select from the following the statement which is true for bases.

Bases are bitter and turn blue litmus red.
Bases have a pH less than 7.
Bases are sour and change red litmus to blue.
Bases turn pink when a drop of phenolphthalein is added to them.

Solution:

Phenolphthalein is a weak acid, which is why when it is added to a strong base, it gives a pink colour and the colour intensifies as the pH of the base increases. Thus, the correct statement regarding bases is that the bases turn pink when a drop of phenolphthalein is added to them.

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