Question

Name three chemical indicators .

Answer 1

Three chemical indicators widely used -
→ Methyl yellow
→ pH indicators 
→ litmus, methylene blue, etc.

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Answer 2

'Three chemical indicators' are "litmus paper", "methyl yellow", "pH indicators".

EXPLANATION:

These are commonly used chemical indicators while there are many more indicators that are made use of.  Chemical indicators are used to demonstrate the changes that take place because of a chemical reaction.

For instance, blue litmus paper can be used to test the actions of acids. Acids turn blue litmus red and so blue litmus can be used in any solution to detect whether an acid is present in the solution or not.