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Phenolphthale...

Question

Phenolphthalein gives a pink colour in alkaline medium due to the fact that:

A

It is coloured compound

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B

It ionises to give coloured ions

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C

It is decomposed by alkali

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D

It forms a complex compound with alkali

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Solution

The correct option is B It ionises to give coloured ions
Phenolphthalien itself weak acid form pink anions when it dissolves in water so it gives pink color in acidic medium.

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