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JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 16 March 2021, Shift 2, Chemistry Q56

Question 56 of 90 in this shift, Chemistry question 26 of 30, Section B.

Sulphurous acid (

\mathrm{H_2SO_3}

) has

K_{a_1}=1.7\times10^{-2}

and

K_{a_2}=6.4\times10^{-8}

. The pH of 0.588 M

\mathrm{H_2SO_3}

is ________. (Round off to the Nearest Integer).

Official answer

1

NTA final key.

Chapter: Equilibrium
Topic: pH and Buffers
Idea tested: pH of Polyprotic Acids

Same idea in other shifts

Asked 2× in all

2 Apr 2026, Shift 2 · Q52The first and second ionization constants of a weak dibasic acid $\mathrm{H_2A}$ are $8.1 \times 10^{-8}$ and $1.0 \times 10^{-13}$ …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.