Question

[30 points out here]
What are Universal Indicators?
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Answer 1

Answer:

A universal indicator is an indicator that can be used to test a wide range of acids and alkalis.

For example-Litmus paper

Answer 2

Answer:

A universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. ... Experiments with Yamada's universal indicator are also described in the Journal of Chemical Education.