Practise 646 real Chemistry questions from 2021 to 2026. See the correct answer and a clear explanation the moment you answer.
A Level Chemistry (Cambridge (CAIE) 9701) is examined in the May/June and Oct/Nov series. Tayyari Karo has real questions from 2021 to 2026 across Paper 1, Paper 2, Paper 3, Paper 4, Paper 5, covering topics such as Practical, Group 2, Periodic Table periodicity, Chemical bonding and Hydrocarbons. The fastest way to improve is to work through real questions and read why each answer is right.
Tayyari Karo collects the real Cambridge (CAIE) Chemistry questions in one place, sorted by paper and topic. 440 of them are multiple choice and marked instantly, and the rest are structured questions with a full model answer.
These are real past-paper questions. Think of your answer first, then open the explanation.
Which contains the largest number of hydrogen atoms?
Answer: C. 1.00 mol of hydrogen molecules
1.00 mol of H2 contains 2.00 mol of H atoms, more than the 1.2, 1.6 or 1.0 mol of H atoms given by the other options.
In which pair of species do both species have only one unpaired p electron?
Answer: C. F and Ga
F (2p⁵) has electron arrangement px²py²pz¹ (1 unpaired); Ga (4p¹) also has just 1 unpaired p electron.
Phosphorus forms two chlorides. Phosphorus(III) chloride, PCl3, is a covalent liquid. Phosphorus(V) chloride is an ionic solid. One of the ions present is [PCl4]⁺. What is the shape of the PCl3 molecule and the [PCl4]⁺ ion?
Answer: B. PCl3 pyramidal, [PCl4]⁺ tetrahedral
PCl3 has 3 bonding pairs + 1 lone pair (pyramidal); [PCl4]⁺ has 4 bonding pairs and no lone pair (tetrahedral, isoelectronic with SiCl4).
Sodium halide salts react with concentrated sulfuric acid at room temperature.
(a)(i) Write an equation to represent the reaction of NaCl(s) with concentrated sulfuric acid. [1]
(ii) Name this type of reaction. [1]
(b) NaI(s) reacts with concentrated sulfuric acid, at room temperature, to form steamy fumes.
(i) Identify the chemical responsible for the steamy fumes. [1]
(ii) The reaction of NaI(s) with concentrated sulfuric acid continues, forming several other products, including a dark grey solid. Identify the chemical responsible for the dark grey solid and one other product of this further reaction. [2]
(c) Explain the differences in observations, at room temperature, when NaI(s) reacts with concentrated sulfuric acid compared to those for NaCl(s). [2]
(d) Complete the equation for the reaction of Br⁻ with excess concentrated H2SO4 at room temperature: ...Br⁻ + ...H⁺ + ...H2SO4 → ... [1]
(a)(i) NaCl + H2SO4 → NaHSO4 + HCl (or 2NaCl + H2SO4 → Na2SO4 + 2HCl)
(ii) Displacement (acid–base) reaction.
(b)(i) Hydrogen iodide, HI.
(ii) Dark grey solid: I2 (iodine). Other product: S (sulfur) or H2S (hydrogen sulfide) or H2O/steam.
(c) Iodide ions are stronger reducing agents than chloride ions, so HI/iodide is oxidised by the concentrated H2SO4 (further redox reactions occur, giving I2, S/H2S) whereas HCl/chloride is not oxidised (only an acid–base reaction occurs with NaCl).
(d) 2Br⁻ + 2H⁺ + H2SO4 → Br2 + 2H2O + SO2
Reducing power of halide ions increases down Group 17 (I⁻ > Br⁻ > Cl⁻), so only I⁻ and Br⁻ are strong enough to reduce concentrated H2SO4.
Number of questions available for each paper.
| Session | Paper 1 | Paper 2 | Paper 3 | Paper 4 | Paper 5 |
|---|---|---|---|---|---|
| May/June 2026 | 40 | 5 | 3 | 9 | 2 |
| May/June 2025 | 40 | 6 | 3 | 10 | 2 |
| Oct/Nov 2025 | 40 | 4 | 3 | 9 | 2 |
| May/June 2024 | 40 | 6 | 3 | 9 | 2 |
| Oct/Nov 2024 | 40 | 4 | 3 | 8 | 2 |
| May/June 2023 | 40 | 5 | 3 | 8 | 3 |
| Oct/Nov 2023 | 40 | 4 | 2 | 9 | 2 |
| May/June 2022 | 40 | 4 | 3 | 7 | 2 |
| Oct/Nov 2022 | 40 | 5 | 3 | 9 | 3 |
| May/June 2021 | 40 | 6 | 3 | 9 | 2 |
| Oct/Nov 2021 | 40 | 4 | 3 | 10 | 2 |
Yes. Every question comes from a real Cambridge (CAIE) Chemistry (9701) paper from 2021 to 2026. Each one shows the year, session and paper it came from.
You can start free with no signup. A small set of papers per subject is free, and Premium unlocks every paper, the full question bank and the paper PDFs.
Yes. Every question gives you the correct answer straight away with a short explanation, so you learn from mistakes instead of just marking them.
Paper 1, Paper 2, Paper 3, Paper 4, Paper 5 across the May/June and Oct/Nov sessions. Multiple-choice questions are marked automatically, and structured questions show a full model answer.
