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Friday, 9 October

JEE Main Chemistry · Equilibrium

pH of Polyprotic Acids

pH of Polyprotic Acids (Equilibrium) was asked 2 times in 2 JEE Main shifts, 2021–2026, out of the 42 shifts Lumi analysed. 1 of the 2 had a numerical answer.

Times asked
2
in 2 shifts
Years
2021–2026
Usual format
Numerical value
Calculation
Pattern
Occasional
repeats across shifts

How it is asked

  • Species concentration in polyprotic acid
  • Ph of polyprotic acid from ka values

Difficulty

Easy 0Medium 1Hard 1

Where it sits

Chapter: Equilibrium. Topic: pH and Buffers, 17 questions over 13 ideas.

Other repeat ideas in this topic

Every time it came

All 2 questions

Newest first, each with its options and official answer.

  1. 2 Apr 2026, Shift 2 · Q52The first and second ionization constants of a weak dibasic acid H2A\mathrm{H_2A} are 8.1×10−88.1 \times 10^{-8} and 1.0×10−131.0 \times 10^{-13}…HardSingle correct
  2. 16 Mar 2021, Shift 2 · Q56Sulphurous acid (H2SO3\mathrm{H_2SO_3}) has Ka1=1.7×10−2K_{a_1}=1.7\times10^{-2} and Ka2=6.4×10−8K_{a_2}=6.4\times10^{-8}. The pH of 0.588 M H2SO3\mathrm{H_2SO_3}…MediumNumerical value