JEE Main 2023ChemistryRedox ReactionsMediumMCQ

JEE Main 2023 — Redox Reactions Question with Solution

JEE Main 2023 (01 Feb Shift 2)

Question

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

Assertion (A) : An aqueous solution of KOH when for volumetric analysis, its concentration should be checked before the use.

Reason (R) : On aging,KOH solution absorbs atmospheric CO2.

In the light of the above statements, choose the correct answer from the options given below.

Choose an option

Show full solutionCorrect option: C
Correct answer
CBoth (A) and (R) are correct and (R) is the correct explanation of (A)

Step-by-step explanation

KOH absorb CO2 based on the following reaction:
CO2(g) + 2KOH(aq) → K2CO3(aq) + H2O(l)
Thus, concentration of Carbon dioxide decreases over time, prior to volumetric analysis concentration of potassium hydroxide should be checked.

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Redox Reactions chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

About this question

This is a previous-year question from JEE Main 2023, 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.