Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
Q, R and S are consecutive elements in Period 3 of the Periodic Table. Element R has the highest first ionisation energy and the lowest melting poi...
A reaction scheme for a Group 2 metal, M, is shown. M --(reacts with oxygen)--> X --(reacts with water)--> Y --(reacts with sulfuric acid)--> Z Whi...
U, V and W represent different halogens. The table shows the results of nine experiments in which aqueous solutions of U2, V2 and W2 were separatel...
J is either MgCl2 or AlCl3. K is either SiO2 or SiCl4. J(aq) add drops of aqueous sodium hydroxide -> white precipitate -> add an excess of aqueou...
River water in an agricultural area contains NH4⁺, CO3²⁻, HCO3⁻, Cl⁻ and NO3⁻ ions. This water is treated by adding a calculated quantity of calciu...
Four atmospheric pollutants are listed. 1 nitrogen oxides 2 carbon monoxide 3 unburnt hydrocarbons 4 sulfur dioxide Which pair of pollutants react ...
Which graph correctly describes a trend found in Group 17? [X represents a halogen atom.]
Gas M is produced when NH4Cl(aq) is heated with CaO(s). Which row is correct?
Two nitrates decompose on heating according to the equations shown. 2Pb(NO3)2(s) → 2PbO(s) + 4NO2(g) + O2(g) 2NH4NO3(s) → 2N2(g) + O2(g) + 4H2O(l) ...
Organic compound X has the empirical formula C2H4O. Compound X is reduced by LiAlH4, but not by NaBH4. What is compound X?
What is the mechanism of the reaction of hydrogen cyanide with propanone?
Which compound may be synthesised from an alkene, with formula C4H8, by an addition reaction?
The structure of compound G is shown. Compound G undergoes addition polymerisation. Which diagram shows the repeat unit of the polymer formed?
Compound T is tested with three reagents and gives the results shown. reagent result 2,4-DNPH orange precipitate Fehling's s...
Reagent X is added separately to 2-methylbutan-1-ol and 3-methylbutan-2-ol. The visible results are different. What is reagent X?
Compound Y is hydrolysed by warm aqueous silver nitrate to form a precipitate that is soluble in dilute aqueous ammonia. Compound Y undergoes an el...
Propan-2-ol can be converted into 2-chloropropane using reagent M followed by reagent N. Which row is correct?
Skeletal formulae of four organic compounds are shown. Which two compounds when separately heated with dilute sulfuric acid produce propanoic acid ...
1-chloro-2-methylpropane and 2-bromo-2-methylbutane react separately with aqueous silver nitrate in ethanol. Both reactions proceed via nucleophili...
The diagram shows the structure of progesterone. Which statement about progesterone is correct?
A molecule of hexane can be cracked in a number of different ways. Three compounds are listed. 1 C3H8 2 C4H8 3 C5H12 Which compounds are found in t...
The diagrams show the structures of two isomeric dicarboxylic acids, X and Y. X can be reduced to compound P with empirical formula C2H5O. Y can be...
What is the total number of sp³ hybridised atomic orbitals used in the bonding of but-2-ene?
Compound L contains carbon atoms. It is analysed in a mass spectrometer. The table shows the relative abundance of the only two peaks recorded with...
Phosphorus and chlorine are elements in Period 3 of the Periodic Table.
The Group 2 elements show metallic bonding.
The halogens chlorine, bromine and iodine show trends in chemical and physical properties down the group. Table 3.1 shows some properties of chlori...
[Figure 4.1] shows compounds J to M, each of which contains four carbon atoms. J: [Figure 4.1 shows CH3CH2CH2CHO] K: [Figure 4.1 shows CH3CH2COCH3]...
2 Many oxidising agents are able to oxidise acidified potassium iodide to iodine in acidic conditions. The amount of iodine produced can be determi...
Silver, Ag, is a metal in the d-block of the Periodic Table.
Propanone, CH3COCH3, is a common organic solvent and reagent.
Fe2+ and Fe3+ ions are able to form a variety of complexes with different species.
Cumene is an aromatic hydrocarbon used in the synthesis of other useful chemicals.
Brass is an alloy of copper and zinc. An experiment is completed to find the percentage by mass of copper in a sample of brass. In the experiment, ...
Ester X has the formula CH3COOR. R is an alkyl group with the general formula CnH2n+1. Ester X undergoes alkaline hydrolysis with aqueous potassium...
Which gas closely approaches ideal behaviour at room temperature and pressure?
Use of the Data Booklet is relevant to this question. What could be the proton number of an element that has three unpaired electrons in each of it...
Use of the Data Booklet is relevant to this question. The elements radon (Rn), francium (Fr) and radium (Ra) have consecutive proton numbers in the...
Some bond energy values are listed below. bond bond energy/kJ mol⁻¹ C-H 410 C-Cl 340 Cl-Cl ...
Given the following enthalpy changes, I2(g) + 3Cl2(g) → 2ICl3(s) ΔΗ° = −214 kJ mol⁻¹ I2(s) → I2(g) ∆H = +38 kJ mol⁻¹ What is the standard enthalpy ...
Ammonium nitrate, NH4NO3, can decompose explosively when heated. ΝΗ4ΝΟ3 → N2O + 2H2O What are the changes in the oxidation numbers of the two nitro...
Which mass of gas would occupy a volume of 3 dm³ at 25 °C and 1 atmosphere pressure? [1 mol of gas occupies 24 dm³ at 25 °C and 1 atmosphere pressu...
Use of the Data Booklet is relevant to this question. 2.920 g of a Group II metal, X, reacts with an excess of chlorine to form 5.287 g of a compou...
The table gives the concentrations and pH values of the aqueous solutions of two compounds, X and Y. Either compound could be an acid or a base. X ...
The Haber process for the manufacture of ammonia is represented by the following equation. N2(g) + 3H2(g) ⇌ 2NH3(g) ΔΗ = −92 kJ mol⁻¹ Which stateme...
The percentage of ammonia obtainable, if equilibrium were established during the Haber process, is plotted against the operating pressure for two t...
Swimming pool water can be kept free of harmful bacteria by adding aqueous sodium chlorate(I), NaOCl. This reacts with water to produce HOCl molecu...
Na2S2O3 reacts with dilute HCl to give a pale yellow precipitate. If 1 cm³ of 0.1 mol dm⁻³ HCl is added to 10 cm³ of 0.02 mol dm⁻³ Na2S2O3 the prec...