____________________change their colour when added to a solution containing an acidic or basic substance.
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indicators
These substances are known as indicators. The indicators change their colour when added to a solution containing an acidic or a basic substance. Turmeric, litmus, china rose petals (Gudhal), etc., are some of the naturally occurring indicators.
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Explanation:
indicators change their colour when added to a solution containing an acidic or basic substance.
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