JEE Main 2022ChemistryIonic EquilibriumHardNumerical

JEE Main 2022 — Ionic Equilibrium Question with Solution

JEE Main 2022 (28 Jul Shift 1)

Question

Ka for butyric acid C3H7COOH is 2×10-5. ThepH of 0.2M solution of butyric acid is____×10-1. (Nearest integer) [Given log2=0.30]

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Show full solutionCorrect answer: 27
Correct answer
27

Step-by-step explanation

Ka of Butyric acid ⇒2×10-5       pKa=-logKa = 4.7

pH of weak acid solution

pH=12pKa-12logC

=124·7-12log0.2

=2.35+0.35=2.7

pH=27×10-1

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About this question

This is a previous-year question from JEE Main 2022, covering the Ionic Equilibrium 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.