Cambridge Past Paper Questions
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X is a salt of one of the halogens chlorine, bromine, iodine, or astatine (proton number 85). The reaction scheme shows a series of reactions using...
Which element of the third period requires the least number of moles of oxygen for the complete combustion of 1 mol of the element?
Two properties of non-metallic elements and their atoms are as follows. property 1 has an oxide that can form a strong acid in water property 2 has...
Consecutive elements X, Y, Z are in the third period of the Periodic Table. Element Y has the highest first ionisation energy and the lowest meltin...
Which property of Group II elements (beryllium to barium) decreases with increasing atomic number?
When gaseous chemicals are transported by road or by rail they are classified as follows. flammable non-flammable poisonous Which commonly transpor...
What will react differently with the two isomeric alcohols, (CH3)3CCH2OH and (CH3)2CHCH2CH2OH?
Which reagent will give similar results with both butanone and butanal?
What is formed when propanone is refluxed with a solution of NaBH4?
Which compound is a product of the hydrolysis of CH3CO2C3H7 by boiling aqueous sodium hydroxide?
When heated with chlorine, the hydrocarbon 2,2-dimethylbutane undergoes free radical substitution. In a propagation step the free radical X• is for...
When an isomer Y of molecular formula C4H9Br undergoes hydrolysis in aqueous alkali to form an alcohol C4H9OH, the rate of reaction is found to be ...
Which isomer of C4H10O forms three alkenes on dehydration?
Which compound exhibits both cis-trans and optical isomerism?
In many countries plastic waste is collected separately and sorted. Some of this is incinerated to provide heat for power stations. Why is pvc, pol...
Polymerisation of 1,1-dichloroethene produces a dense, high melting point substance that does not allow gases to pass through. It is used as cling ...
Sodium hydrogensulfide, NaSH, is used to remove hair from animal hides. Which statements about the SH⁻ ion are correct? 1 It contains 18 electrons....
Which diagrams represent part of a giant molecular structure? [Figure 32 - Three diagrams labeled 1, 2, 3]
Which reactions are redox reactions? 1 CaBr2 + 2H2SO4 → CaSO4 + Br2 + SO2 + 2H2O 2 CaBr2 + 2H3PO4 → Ca(H2PO4)2 + 2HBr 3 CaBr2 + 2AgNO3 → Ca(NO3)2 +...
When organic refuse decomposes in water carboxylic acids are formed. The water becomes acidic and aquatic life is destroyed. Which additives are su...
In a car engine, non-metallic element X forms a pollutant oxide Y. Further oxidation of Y to Z occurs in the atmosphere. In this further oxidation,...
Sulfur dioxide and sulfites are used in food preservation. Why are they used for this purpose? 1 They are reducing agents so retard the oxidation o...
Which reactions are examples of nucleophilic substitution? 1 CH3CH2Br + OH⁻ → CH3CH2OH + Br⁻ 2 CH3I + H2O H⁺ → CH3OH + HI 3 CH3CH2CH2Cl + NH3 → CH3...
Propanoic acid occurs naturally as a result of the bacterial fermentation of milk, and is partly responsible for the flavour of Swiss cheese. [Figu...
Which structural formulae represent 2,2-dimethylpentane? 1 (CH3)2CHCH2CH(CH3)2 2 (CH3)3CCH2CH2CH3 3 CH3CH2CH2C(CH3)3
The diagram shows some laboratory apparatus. [Figure 40 - Laboratory apparatus for distillation] Which preparations could this apparatus be used fo...
Helium, He, is the second element in the Periodic Table. Tritium is the isotope of hydrogen ³H. What is the same in an atom of He and an atom of ³H?
Which diagram correctly shows the bonding in the ammonium ion, NH4+? key • N electron × H electron [Figure 2.1]
Aluminium is the most abundant metal in the Earth's crust. The extraction of aluminium is carried out by the electrolysis of aluminium oxide dissol...
The esterification reaction ethanol + ethanoic acid ⇌ ethyl ethanoate + water is an equilibrium. The forward reaction is exothermic. How can the va...
Ammonia is manufactured on a large scale by the Haber process. In a particular plant, conditions of 400 °C and 250 atm in the presence of an iron c...
The Boltzmann distribution for a gas at constant temperature is shown below. [Figure 6.1] If the temperature of the gas is reduced by 10°C the grap...
Titanium occurs naturally as the mineral rutile, TiO2. One possible method of extraction of titanium is to reduce the rutile by heating with carbon...
In the conversion of compound X into compound Z, it was found that the reaction proceeded by way of compound Y, which could be isolated. The follow...
Tanzanite is used as a gemstone for jewellery. It is a hydrated calcium aluminium silicate mineral with a chemical formula Ca2AlxSiyO12(OH).6½H2O. ...
0.144 g of an aluminium compound X react with an excess of water, to produce a gas. This gas burns completely in O2 to form H2O and 72 cm³ of CO2 o...
Use of the Data Booklet is relevant to this question. Which element is likely to have an electronegativity similar to that of aluminium?
In 1999, researchers working in the USA believed that they had made a new element and that it had the following electronic configuration. [Rn] 5f14...
The highest oxides of the elements sodium to chlorine are separately added to water. Which diagram best represents the pH of the resulting mixtures...
The diagram shows the first ionisation energies of 11 consecutive elements. [Figure 15.1] Which type of elements are labelled X and Y?
Why does aluminium oxide dissolve in sodium hydroxide solution?
Concentrated sulfuric acid can behave both as a strong acid and as an oxidising agent. With which compound does concentrated sulfuric acid react in...
In the Contact process, what is the nature of the gaseous product and what is the identity of the catalyst?
Which reagent gives the same visible result with propanal and with propan-2-ol?
Which halogenoalkane will undergo an SN1 reaction and produce a yellow precipitate when AgNO3(aq) is added to it?
Which reaction will give 2-chloropropane in the best yield?
The products obtained by cracking an alkane, X, are methane, ethene and propene. The mole fraction of ethene in the products is 0.5. What is the id...
Which compound does not show cis-trans isomerism?
Which formulae show propanone and propanal as different compounds?
How many isomers with the formula C5H10 have structures that involve π bonding?