What is the definition of indicator and its kind

1.	What is the definition of indicator and its kind
Answer» Substances which show the acidic or basic behavior of other substance by change in colour are known as indicator.Type of Indicator: There are many types of indicators. Some common types of indicators are\tNatural\tOlfactory Indicator\tSynthetic Indicator\tUniversal Indicator Indicators are substances that change colour when they are added to acidic or alkaline solutions.

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