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Saturday, 31 October

JEE Main · Chemistry · Solutions

pH of Weak Acids and Bases

JEE Main asked pH of Weak Acids and Bases 4 times in 4 of the 108 shifts Lumi analysed, in 2020, 2021, 2022 and 2026. It belongs to pH and Buffers, in Solutions (Chemistry). The longest wait between two years asking it was 4 years.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
4 of 8
First asked
2020
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170.08’200.03’210.03’220’230’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 1 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 in 8 shifts · 2026: 1 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20261 of 9
  • 20250 of 8
  • 20240 of 18
  • 20230 of 12
  • 20221 of 24
  • 20211 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: multi-step.

  • Expression for degree of dissociation
  • Ph of weak acid from ka

Difficulty

Easy 1Medium 0Hard 3

3 of the 4 questions had a numerical answer.

Every question

All 4 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 6 Apr 2026, Shift 2 · Q56Given is a concentrated solution of a weak electrolyte AxBy\mathrm{A_xB_y} of concentration 'c' and dissociation constant 'K'. The degree of…HardSingle correct
  2. 28 Jul 2022, Shift 1 · Q85KaK_a for butyric acid (C3H7COOH\mathrm{C_3H_7COOH}) is 2×10−52\times10^{-5}. The pH of 0.2 M solution of butyric acid is __________…EasyNumerical value
  3. 3 Aug 2021, Shift 1 · Q55If 1 M solution of acetic acid is diluted xx times so that pH of the solution is doubled. The value of of xx is (Ka\mathrm{K_a} =…HardNumerical value
  4. 5 Sep 2020, Shift 1 · Q48A soft drink was bottled with a partial pressure of CO2\mathrm{CO_2} of 3 bar over the liquid at room temperature. The partial pressure of…HardNumerical value

Shifts: 5 Sep 2020, Shift 1, 3 Aug 2021, Shift 1, 28 Jul 2022, Shift 1, 6 Apr 2026, Shift 2.

Same topic

Other ideas in pH and Buffers

pH and Buffers has 22 ideas JEE Main has asked; 11 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas