Updated November 2026. These KCSE 2026 Chemistry Paper 2 (233/2) predicted questions are built from past-paper trends: we ranked the topics that past KCSE Chemistry Paper 2 papers test most often, then wrote original practice questions on them. They are not leaked, official or guaranteed questions, and this site is not linked to KNEC or KICD. Use them to practise the areas most likely to appear, alongside your full syllabus revision.
KCSE Chemistry 233/2 prediction: most commonly tested topics
The ranking below comes from the topic coverage of past KCSE papers, as summarised in our paper guides. It is a ranking, not an exact count: exam papers change every year.
| Rank | Topic | How it is usually tested |
|---|---|---|
| 1 | Organic chemistry | Alkanes, alkenes, alkynes, alkanols, alkanoic acids, polymers, naming and reactions |
| 2 | Mole concept and calculations | Moles, empirical formula, molar volume, titration calculations |
| 3 | Electrochemistry | Electrochemical series, cells, electrolysis and Faraday calculations |
| 4 | Rates of reaction and equilibrium | Factors affecting rate, Le Chatelier’s principle |
| 5 | Energy changes | Enthalpy, Hess’s law, energy level diagrams, fuels |
| 6 | Metals | Extraction of iron, aluminium, zinc, copper, sodium |
| 7 | Radioactivity | Half-life, decay equations, uses and dangers |
Free sample: 3 KCSE 2026 Chemistry Paper 2 predicted questions
Q1. Name CH₃CH₂CH₂OH and give the product when it reacts with ethanoic acid in the presence of concentrated sulphuric(VI) acid.
Marking scheme
Propan-1-ol. It forms the ester propyl ethanoate (and water).
Q2. A current of 2 A is passed through copper(II) sulphate solution for 30 minutes. Find the mass of copper deposited (Cu = 63.5, 1F = 96,500 C).
Marking scheme
Q = 2 × 1,800 = 3,600 C. Cu²⁺ needs 2F per mole, so mass = 3,600/193,000 × 63.5 ≈ 1.18 g.
Q3. A radioactive isotope has a half-life of 8 days. What fraction remains after 24 days?
Marking scheme
24/8 = 3 half-lives, so (1/2)³ = 1/8 remains.
Full set: 16 more predicted questions with marking scheme
16 more predicted questions with full marking schemes are locked. They cover every topic in the table above.
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Frequently asked questions
Are these the real KCSE 2026 Chemistry Paper 2 questions?
No. Nobody outside KNEC knows the real questions, and any site claiming a leak is lying or breaking the law. These are original practice questions written by the CBC Guide team, predicted from the topics past KCSE papers test most often.
Which topics come up most in KCSE Chemistry Paper 2 (233/2)?
The most commonly tested areas in past papers are Organic chemistry, Mole concept and calculations, Electrochemistry, Rates of reaction and equilibrium. The full ranked list is in the table above.
How do I get the full set of predicted questions?
The first 3 questions are free. The remaining 16, each with a marking scheme, unlock with the KSh 20 Day Pass or the KSh 500 Monthly Pass, paid by M-Pesa. The passes do not auto-renew.
How should I use predicted questions in the last days before the exam?
Answer each question under time, mark it with the scheme, then go back to your notes for any topic you got wrong. Do not skip topics that are not on this list, because KNEC can test any part of the syllabus.
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