JEE Main 2022ChemistryRedox ReactionsRedox TitrationeasyMCQ

JEE Main 2022 — Redox Reactions Question with Solution

From: JEE Main 2022 (Online) 26th July Evening Shift

Question

Given below are two statements: one is labelled as Assertion and the other is labelled as Reason .

Assertion A: Phenolphthalein is a 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.

Choose an option

Show full solutionCorrect option: C
Correct answer
CA is true but R is false.

Step-by-step explanation

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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About this question

This is a previous-year question from JEE Main 2022, covering the Redox Reactions chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.