Question

what is indicator ?​

Answer 1

Answer:

chemical compound that changes color and structure when exposed to certain conditions and is therefore useful for chemical tests. Litmus, for example, is an indicator that becomes red in the presence of acids and blue in the presence of bases.

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Answer 2

hii.....

something that gives information or shows something; a sign

or...

the flashing light on a car, etc. that shows that it is going to turn right or left

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