Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Phenolphthalein is a pH dependent indicator, remains colourless in acidic solution and gives pink colour in basic medium
Reason R : Phenolphthalein is a weak acid. It doesn’t dissociate in basic medium.
In the light of the above statements, choose the most appropriate answer from the options given below :

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Both A and R are true and R is the correct explanation of A

A is false but R is true

A is true but R is false

Both A and R are true but R is NOT the correct explanation of A.

answer is C.

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Detailed Solution

Phenolphthalein dissociate in basic medium

$HPh (aq) ⇌ H^{+} + {Ph}^{-} (colourless) (Pink)$

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