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JEE Main 2022 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 28 July 2022, Shift 1, Chemistry Q85

Question 85 of 90 in this shift, Chemistry question 25 of 30, Section B.

K_a

for butyric acid (

\mathrm{C_3H_7COOH}

) is

2\times10^{-5}

. The pH of 0.2 M solution of butyric acid is __________

\times10^{-1}

. (Nearest integer) [Given

\log 2=0.30

]

Official answer

27

NTA final key (2022 Session 2).

Chapter: Equilibrium
Topic: pH and Buffers
Idea tested: pH of Weak Acids and Bases

Same idea in other shifts

Asked 2× in all

6 Apr 2026, Shift 2 · Q56Given is a concentrated solution of a weak electrolyte $\mathrm{A_xB_y}$ of concentration 'c' and dissociation constant 'K'. The degree of…HardSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.