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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?
(a) An indicator is a "dye" that shows a distinct change in colour (or smell in case of olfactory indicator) when put in acid or base.
Litmus, Methyl orange and phenolphthalein are examples for indicators.
(b) Litmus is the acid-base indicator extracted from lichen.
(c) When turmeric paper is dipped in alkaline solution it will turn red.
Updated on: 10-Oct-2022
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