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Previous year question hub

Chemical Equilibria - Life Sciences Previous Year Questions

Practice Chemical Equilibria - Life Sciences previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

18Papers
18Years
42Questions
1Topics

Chemical Equilibria question pattern

Every graph below is calculated only from this selection.

Questions by year

Compare question counts across years.

Difficulty distribution

How the classified questions are distributed by difficulty.

Easy 24 57.1%
Medium 16 38.1%
Hard 2 4.8%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

MCQ 23 54.8%
Numerical Answer Type (NAT) 17 40.5%
MSQ 1 2.4%
Fill in the blanks 1 2.4%

Subject weightage

Top subjects by unique question coverage.

Life Sciences
42 Qs

Most asked topics

Top topics across the included previous year papers.

Chemical Equilibria
42 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Ionic Equilibria, Buffers and Solubility
29 Qs
Colligative Properties
8 Qs
Homogeneous Reaction Equilibria
5 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

Life Sciences (XL) 2026
1 Qs
Life Sciences (XL) 2025
2 Qs
Life Sciences (XL) 2024
3 Qs
Life Sciences (XL) 2023
3 Qs
Life Sciences (XL) 2022
2 Qs
Life Sciences (XL) 2021
1 Qs
Life Sciences (XL) 2020
2 Qs
Life Sciences (XL) 2019
2 Qs
Life Sciences (XL) 2018
2 Qs
Life Sciences (XL) 2016
1 Qs
Life Sciences (XL) 2014
2 Qs
Life Sciences (XL) 2013
4 Qs
Life Sciences (XL) 2012
2 Qs
Life Sciences (XL) 2011
4 Qs
Life Sciences (XL) 2010
2 Qs
Life Sciences (XL) 2009
3 Qs
Life Sciences (XL) 2008
4 Qs
Life Sciences (XL) 2007
2 Qs

Browse by subtopics

Open a focused page built from the same verified paper data.

Ionic Equilibria, Buffers and Solubility

Explore previous-paper coverage, trends and focused practice for Ionic Equilibria, Buffers and Solubility.

29 questions16 papers16 years

Colligative Properties

Explore previous-paper coverage, trends and focused practice for Colligative Properties.

8 questions8 papers8 years

Homogeneous Reaction Equilibria

Explore previous-paper coverage, trends and focused practice for Homogeneous Reaction Equilibria.

5 questions4 papers4 years

Included previous year papers

Newest papers appear first. Search these papers or sort by year and name.

Paper nameYearPDFAttempt
Life Sciences (XL) 20262026
1 questions in this view		2026
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Life Sciences (XL) 20252025
2 questions in this view		2025
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Official question paperOriginal authority-issued PDF Official Download Official answer keyOriginal authority-issued PDF Official Download
Life Sciences (XL) 20242024
3 questions in this view		2024
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Official question paperOriginal authority-issued PDF Official Download Official answer keyOriginal authority-issued PDF Official Download
Life Sciences (XL) 20232023
3 questions in this view		2023
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Life Sciences (XL) 20222022
2 questions in this view		2022
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Official question paperOriginal authority-issued PDF Official Download Official answer keyOriginal authority-issued PDF Official Download
Life Sciences (XL) 20212021
1 questions in this view		2021
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Official question paperOriginal authority-issued PDF Official Download Official answer keyOriginal authority-issued PDF Official Download
Life Sciences (XL) 20202020
2 questions in this view		2020
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Official question paperOriginal authority-issued PDF Official Download
Life Sciences (XL) 20192019
2 questions in this view		2019
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Official question paperOriginal authority-issued PDF Official Download
Life Sciences (XL) 20182018
2 questions in this view		2018
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Official question paperOriginal authority-issued PDF Official Download
Life Sciences (XL) 20162016
1 questions in this view		2016
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Official question paperOriginal authority-issued PDF Official Download
Life Sciences (XL) 20142014
2 questions in this view		2014
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Official question paperOriginal authority-issued PDF Official Download
Life Sciences (XL) 20132013
4 questions in this view		2013
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Official question paperOriginal authority-issued PDF Official Download
Life Sciences (XL) 20122012
2 questions in this view		2012
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Official question paperOriginal authority-issued PDF Official Download
Life Sciences (XL) 20112011
4 questions in this view		2011
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Official question paperOriginal authority-issued PDF Official Download
Life Sciences (XL) 20102010
2 questions in this view		2010
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Official documents
Official question paperOriginal authority-issued PDF Official Download
Life Sciences (XL) 20092009
3 questions in this view		2009
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Official documents
Official question paperOriginal authority-issued PDF Official Download
Life Sciences (XL) 20082008
4 questions in this view		2008
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Official documents
Official question paperOriginal authority-issued PDF Official Download
Life Sciences (XL) 20072007
2 questions in this view		2007
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Official question paperOriginal authority-issued PDF Official Download

Sample previous year questions

A varied preview from the papers represented in this selection, with every available option.

1
2007 · Life Sciences · Chemical Equilibria · Ionic Equilibria, Buffers and Solubility
Life Sciences (XL) 2007
The acid dissociation constant of a weak acid HA is 10-2. A 0.20 M solution of the acid HA also contains 0.10 M of salt MA2. The pH of the solution is
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2
2008 · Life Sciences · Chemical Equilibria · Ionic Equilibria, Buffers and Solubility
Life Sciences (XL) 2008
The pH of a \(10^{-8}\) molar hydrochloric acid solution is
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3
2009 · Life Sciences · Chemical Equilibria · Homogeneous Reaction Equilibria
Life Sciences (XL) 2009

The total pressure (in bar) needed for 50% conversion of P into Q is

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4
2010 · Life Sciences · Chemical Equilibria · Homogeneous Reaction Equilibria
Life Sciences (XL) 2010
Consider the following equilibrium reaction:
CO (g) + Cl₂ (g) ⇌ COCl₂ (g)
0.60 atm of CO and 1.10 atm of Cl₂ were mixed in a constant volume reaction vessel at a particular temperature. After the equilibrium was established, 0.10 atm of COCl₂ was observed. The equilibrium constant for the reaction is
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5
2011 · Life Sciences · Chemical Equilibria · Homogeneous Reaction Equilibria
Life Sciences (XL) 2011
Consider the following equilibrium
\[ \text{SO}_2 (g) + \frac{1}{2} \text{O}_2 (g) \rightleftharpoons \text{SO}_3 (g), \Delta H = -23.5 \text{ kcal mol}^{-1} \]
The formation of SO₃ is favoured by
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6
2012 · Life Sciences · Chemical Equilibria · Ionic Equilibria, Buffers and Solubility
Life Sciences (XL) 2012
The value of ionic product of water changes with temperature. It is 1 × 10-14 at 25 °C and 1 × 10-13 at 60 °C. The CORRECT statement with respect to ΔH and ΔS is
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