Define INDICATOR Class7
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An indicator is a 'dye' that changes colour when it is put into an acid or a base. An indicator gives different colours in acid and base. A substance which contains an acid is said to be acidic whereas the substance which contains a base is said to be basic.
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Substances that are used to indicate whether a substance is acid or a base are known as indicators. They change their colour on addition of a solution containing an acidic or a basic substance.
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