Question

1) What is indicator. Explain in detail with examples.
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Answer 1

Answer:

Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.

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Answer 2

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An indicator is a substance that changes its color in acidic and basic medium. An indicator shows one color in an acidic medium and different colors in a basic medium so that they are called indicators. ... Indicators derived from natural sources are called natural indicators. eg:- Litmus, red cabbage.