Visual indicators change their on addition of an acid or a base.

state

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colour

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odour

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Solution

The correct option is B colour
A visual indicator is a natural or a synthetic chemical that changes its colour on the addition of an acid or a base.
For example, phenolphthalein is a colourless indicator which remains colourless in acidic medium, but turns pink upon addition of a base.

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Why do visual indicators show a a change in colour when introduced to an acidic or basic or medium

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