O Level Chemistry Past Papers
Paper 1
Exam sittings
| Session | Questions | Syllabus code |
|---|---|---|
| November 2019 | 38 | 4024/1 |
| November 2018 | 40 | 4024/1 |
| November 2017 | 40 | 5071/1 |
| November 2016 | 39 | 5071/1 |
| November 2015 | 40 | 5071/1 |
| November 2014 | 39 | 5071/1 |
| November 2013 | 39 | 5071/1 |
Topics covered
Organic chemistryAtomic structureRedoxExtraction of metalsPolymersEnergy changesIonic bondingMetalsStoichiometryAcids and bases
Sample questions
- The diagram shows a chromatogram obtained using solutions of four single dyes. Which…
- The diagram shows ammonium chloride being heated. Which process is taking place?
- The diagram shows a chromatogram of the dyes present in five different inks. What is the…
- The graph shows a cooling curve of a substance, P. Section YZ represents
- Which one is an example of a change of state?
- Which is the best way to test for the purity of propanoic acid?
- Which process involves a change of state?
- Which change of state represents sublimation?
- Which method is not suitable for separating a mixture of sand and water?
- An investigation to identify the ink used to make a fake one hundred dollar note using…
- Which gas has the smallest rate of diffusion?
- Which gas has the fastest rate of diffusion?
- The diagram shows a chromatogram obtained using solutions of three single dyes (blue,…
- When liquid water changes into steam, the molecules
- An amino acid has an R_f value of 0.75. Which of the components A, B, C or D in the…
- An example of a solid with a giant molecular structure is
- Which pair correctly describes the structure of an atom?
- Which diagram correctly represents a sulphide ion, S^{2-}?
Paper 2
Exam sittings
| Session | Questions | Syllabus code |
|---|---|---|
| November 2019 | 30 | 4024/2 |
| November 2018 | 30 | 4024/2 |
| November 2017 | 27 | 5071/2 |
| November 2016 | 27 | 5071/2 |
| November 2015 | 30 | 4024/2 |
| November 2014 | 27 | 5071/2 |
| November 2013 | 24 | 5071/2 |
Topics covered
Electrolysis and electroplatingAlkanes, homologous series and isomerismAlloys; titration of an iron alloy with potassium dichromateAtom/isotope definitions, subatomic particle counting, dot-and-cross diagram of magnesium nitrideAtomic structure, ions and covalent bondingAtomic structure, metallic and ionic bonding, dot-and-cross diagramBlast furnace impurities, butenedioic acid reactions, addition polymerisationBonding in ammonium nitrateCarbon dioxide equilibrium in fizzy drinks; ammonium salts and calcium chloride's roleContact process flow diagram; converting sulphuric acid to ammonium sulphate fertilizer
Sample questions
- Fig. 1 shows structures of four atoms/ions, A, B, C and D, drawn as nucleus-and-shell…
- In the Contact process for manufacturing sulfuric acid, Fig.5's flow diagram shows sulfur…
- In Fig. 1, atom A forms a covalent compound with hydrogen, shown by a dot-and-cross…
- Chlorine-35, ³⁵Cl, has atomic (proton) number 17. State the number of neutrons in one…
- A student added black copper(II) oxide powder to nitric acid, forming a blue solution P…
- An element X has the electron configuration 2, 8, 3. In which period of the periodic…
- Which of the following correctly defines the term diffusion?
- Element E has an electron arrangement of 2,8,7 across its three shells. What is the…
- A burette containing sodium hydroxide solution, NaOH(aq), is clamped above a conical…
- Methane (CH4) is the covalent compound formed when atom A in Fig. 1 bonds with four…
- Which statement correctly describes a difference between a chlorine atom, Cl, and a…
- Write a balanced chemical equation, with state symbols, for the reaction between zinc…
- An element X has the electron configuration 2, 8, 3. State, in one word, whether X is a…
- Cotton wool soaked in concentrated ammonia is placed at one end of a glass tube, and…
- Element D has an electron arrangement of 2,8,2 across its three shells, and exists as a…
- In a titration where sodium hydroxide solution, NaOH(aq), is added from a burette into a…
- Which of the following Period 3 oxides is amphoteric, reacting with both acids and bases?
- Carbon tetrachloride, CCl4, is a liquid at room temperature while calcium chloride,…
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