Verified Solution • 2025–26 Session moderate

QJEEM22Ch8cce: JEE Main 2022 Chemistry - Class 11 JEEM22Ch8cce Solution: Given below are two statements: one is labelled as Assertion…

Given below are two statements: one is labelled as Assertion A\mathbf{A} and the other is labelled as Reason R\mathbf{R} .

Assertion A: Phenolphthalein is a pH\mathrm{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.

Multiple Choice Options

  • A Both A\mathbf{A} and R\mathbf{R} are true and R\mathbf{R} is the correct explanation of A\mathbf{A} .
  • B Both A\mathbf{A} and R\mathbf{R} are true but R\mathbf{R} is NOT the correct explanation of A\mathbf{A} .
  • C A is true but R is false.
  • D A is false but R is true.

Step-by-Step Verified Solution

Phenolphthalein is a pH dependent indicator. It is a weak acid which is colourless in the acidic solution but gives pink colour in basic medium. The pink colour is due to its conjugate form. Therefore, assertion (A) is true but Reason (R) is false.

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