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Q.

Colours of phenolphthalein indicator in acidic and basic medium, respectively are _________.

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a

Colourless, pink

b

Pink, purple

c

Pink, colourless

d

Purple, pink

answer is C.

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Detailed Solution

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Phenolphthalein doesn’t react with acid, it is colourless in acid. On the other hand, it reacts with strong bases and turns pink in colour as the alkali solution absorbs light. Usually, all the colours of the light tend to pass through the acidic solution of phenolphthalein giving it a colourless appearance.

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