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(a) What is an indicator ? Name three common indicators.(b) Name the acid-base indicator extracted from lichen.(c) What colour does the turmeric paper turn when put in an alkaline solution ? |
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Answer» (a) An indicator is a ‘dye’ that changes colour when it is put in an acid or a base. The three most common indicators are: Litmus, Methyl orange and Phenolphthalein. (b) Litmus. (c) Red. |
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