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

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purple, pink

pink, purple

pink, colorless

colorless, pink

answer is C.

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Detailed Solution

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

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