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Saturday, 31 October

JEE Main · Chemistry · Equilibrium

Kp for PCl5 Dissociation Type Reactions

JEE Main asked Kp for PCl5 Dissociation Type Reactions 4 times in 4 of the 108 shifts Lumi analysed, in 2021, 2024, 2025 and 2026. It belongs to Chemical Equilibrium, in Equilibrium (Chemistry). The longest wait between two years asking it was 3 years.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
4 of 8
First asked
2021
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2024, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170’200.03’210’220’230.05’240.13’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 in 18 shifts · 2025: 1 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
  • 20251 of 8
  • 20241 of 18
  • 20230 of 12
  • 20220 of 24
  • 20211 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: application.

  • Kp expression from extent of dissociation
  • True statement selection on degree of dissociation

Difficulty

Easy 0Medium 4Hard 0

1 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. 5 Apr 2026, Shift 2 · Q56The reaction A(g)⇌B(g)+C(g)\mathrm{A(g)\rightleftharpoons B(g)+C(g)} was initiated with the amount 'a' of A(g). At equilibrium it is found that the…MediumSingle correct
  2. 2 Apr 2025, Shift 2 · Q55Consider the following chemical equilibrium of the gas phase reaction at a constant temperature :…MediumSingle correct
  3. 31 Jan 2024, Shift 2 · Q64A(g)⇌B(g)+C2(g)\mathrm{A_{(g)}\rightleftharpoons B_{(g)}+\frac{C}{2}{}_{(g)}} The correct relationship between Kp\mathrm{K_p}, α\alpha and equilibrium…MediumSingle correct
  4. 24 Feb 2021, Shift 1 · Q56At 1990 K and 1 atm pressure, there are equal number of Cl2\mathrm{Cl_2} molecules and Cl atoms in the reaction mixture. The value of KpK_p…MediumNumerical value

Shifts: 24 Feb 2021, Shift 1, 31 Jan 2024, Shift 2, 2 Apr 2025, Shift 2, 5 Apr 2026, Shift 2.

Same topic

Other ideas in Chemical Equilibrium

Chemical Equilibrium has 17 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