Question

Write about the acids bases and indicators?

Answer 1

acids: have sour taste e.g. lemon juice, they turn blue litmus red. they are corrosive in concentrated form.
bses: have bitter taste e.g. soap. they are non corrosive.

Answer 2

the substance that's taste sour is called acids
While
indicators are the substances which show different behaviour in acidic and basic medium and thus help in chemical nature of the substance.