Updated November 2026. These KCSE 2026 Chemistry Paper 3 (Practical) (233/3) predicted questions are built from past-paper trends: we ranked the topics that past KCSE Chemistry Paper 3 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 233/3 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 | Titration (volumetric analysis) | Burette readings table, average titre, moles and concentration |
| 2 | Qualitative analysis of inorganic ions | Observations and inferences with NaOH, NH₃, Ba²⁺, Pb²⁺ and other reagents |
| 3 | Organic tests | Tests for C=C, –OH and –COOH with bromine water, acidified KMnO₄ and sodium carbonate |
| 4 | Rates or thermochemistry experiment | Tabulating time or temperature, plotting a graph, reading values off it |
Free sample: 3 KCSE 2026 Chemistry Paper 3 predicted questions
Q1. A burette reads 0.50 cm³ at the start and 24.70 cm³ at the end. What is the titre and how should it be recorded?
Marking scheme
24.20 cm³, recorded to 2 decimal places, in a table with final, initial and volume used rows.
Q2. To a solution of an unknown salt, aqueous sodium hydroxide is added dropwise until in excess. A white precipitate forms that dissolves in excess. What ions may be present?
Marking scheme
Zn²⁺, Al³⁺ or Pb²⁺.
Q3. A substance decolourises acidified potassium manganate(VII). What does this suggest?
Marking scheme
It may contain a C=C or C≡C bond, or be an alkanol (an –OH group), so it is a reducing agent.
Full set: 15 more predicted questions with marking scheme
15 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 3 (Practical) 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 3 (Practical) (233/3)?
The most commonly tested areas in past papers are Titration (volumetric analysis), Qualitative analysis of inorganic ions, Organic tests, Rates or thermochemistry experiment. 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 15, 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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