Fuhua 2018 Prelim P1

2 Multiple Choice Questions [40 marks] Answer all questions and shade your answers on the OMR sheet provided. 1 What physical processes could be used to separate ethanol and water? 1 distillation 2 filtration 3 sublimation 4 use of separating funnel A 1 only B 1 and 4 only C 1, 2 and 3 only D 1, 2, 3 and 4 2 A mixture of gases is passed through the apparatus shown. Only one of the gases is collected. What is the property of this gas? A The gas burns with a blue flame. B The gas explodes in the presence of a lighted splint. C The gas produces a white precipitate in limewater. D The gas turns moist red litmus blue. 3 The conical flask contains compound X which is present in the solid, liquid and gaseous states. Which statement is correct? A A gaseous X molecule has a lower mass than a liquid X molecule. B Energy is released when X changes from liquid to solid. C Liquid X is at a higher temperature than solid X. D Liquid X molecules vibrate about fixed positions. gas mixture aqueous sodium hydroxide aqueous bromine water FHSS 2018 Prelim P1 and P2

3 4 An experiment was set up as shown below. It was observed that after leaving it for several days, the liquid in the jar had the same colour throughout. This was the result of the movement of A iodine and water molecules. B iodine molecules. C iodide ions and iodine atoms. D iodide ions and water molecules. 5 Aqueous sodium hydroxide was added to a mixture of an aqueous solution of Z. On warming, ammonia gas evolved. When aluminium foil is added to the reaction mixture and warmed, more ammonia gas was given off. What could be the identity of Z? A aluminium nitrate B aluminium sulfate C ammonium nitrate D ammonium sulfate 6 The table gives the electrical conductivity of four substances. P does not conduct under any condition Q conducts when dissolved in water R conducts when molten S conducts when solid and when molten What could be the identity of P, Q, R and S? P Q R S A ammonia ethanol magnesium oxide zinc B ammonia magnesium oxide ethanol zinc C ethanol ammonia magnesium oxide zinc D magnesium oxide ammonia zinc ethanol water iodine

4 7 Compound P contains two elements, metal Q and non-metal, R. P consist of a lattice of positive and negative ions. Each positive ion is surrounded by four anions and each negative ion is surrounded by two cations. What ions are present in, and what is the formula of, compound P? ions present formula A Q+ R2- Q2R B Q2+ R- QR2 C R+ Q2- R2Q D R2+ Q- RQ2 8 When excess aqueous ammonia is added to an aqueous solution of a salt X, a white precipitate forms. X also produces a white precipitate when added to aqueous lead(II) nitrate. X could be A aluminium sulfate B calcium chloride C zinc chloride D zinc sulfate 9 Which of the following descriptions best distinguishes a weak acid from a strong acid? A A weak acid is obtained by diluting a strong acid. B A solution of a weak acid contains its own molecules. C A solution of a weak acid has more hydrogen ions than hydroxide ions. D All organic acids are weak acids and all inorganic acids are strong acids. 10 The formula of an oxide of element Y is Y2O. 8.7g of Y2O contains 7.1g of Y. How many moles of Y does 7.1g of the element contain? A 1.6 16 ×2 B 1.6 16 × 1 2 C 8.7 16 ×2 D 8.7 16 × 1 2

5 11 In an electrolysis experiment, the same amount of charge deposited 16.25g of zinc and 5.1g of vanadium. What was the charge on the vanadium ion? A 2+ B 3+ C 4+ D 5+ 12 A small piece of sodium is added to aqueous iron(II) sulfate. Which of the following is not observed during this reaction? A A grey solid is formed. B A white precipitate is formed. C Bubbles of gas are formed. D The pale green solution turns colourless. 13 In which process is energy released? A cracking of hydrocarbons B electrolysis of molten lead(II) bromide C freezing of water D photosynthesis 14 Which structure does not contain atoms bonded to other atoms by four covalent bonds? A ethene B diamond C graphite D polyethene 15 The formation of metallic oxides involves the transfer of electrons from the metal atoms to oxygen atoms. In the formation of one mole of which metallic oxide do the metal atoms not transfer exactly two mole of electrons? A calcium oxide B iron(III) oxide C zinc oxide D sodium oxide

6 16 Which of the following reactions involve oxidation? A I only B II only C I and II D II and III 17 A drug was tested for purity through chromatography using propanol as the solvent. If the drug has an Rf value of 0.60, at which point should the spot be found? 18 Which of the following reactions is not a reduction reaction? A Chorine displaces aqueous iodide to form chloride ions. B Conversion of nitrogen dioxide in the catalytic converter. C Discharge of aluminium ions at the cathode. D Wine turns sour. C2H5OH CH3COOH CH3COONa CH3COOC2H5 I II III solvent front A B C D starting line 20 15 10 5 0

7 19 The dissociation constant (Kb) for a base indicates the extent to which it dissociates into ions in water. The higher the dissociation constant (K b), the greater the extent of dissociation of the base. Hence, a stronger base will have a higher Kb value. Generally, compounds from the amine homologous series form weak bases when dissolved in water. The K b values and structural formulae of some amine compounds are given in the following table. amine structural formulae dissociation constant (Kb) methylamine CH3NH2 3.55×10-3 ethylamine CH3CH2NH2 4.53×10-5 propylamine CH3CH2CH2NH2 4.61×10-5 2-chloroethylamine ClCH2CH2NH2 4.28×10-2 Based on the data above, which statement is correct? A Aqueous methylamine turns universal indicator from green to violet. B Increasing the length of the carbon chain makes the base stronger. C Replacing a hydrogen atom by a chlorine atom in ethylamine makes the base weaker. D There are less OH- ions in a solution of ethylamine than that in a solution of propylamine of the same concentration. 20 Which metal will displace hydrogen from steam but not from cold water? A calcium B copper C magnesium D zinc 21 The thermal stability of metal nitrates is related to the position of the metal in the reactivity series in the same way as carbonates. Which metal nitrate, on heating, will decompose to form the metal oxide? A calcium nitrate B potassium nitrate C silver nitrate D sodium nitrate 22 Metal M can be obtained from its oxide by heating with carbon and from its aqueous chloride by electrolysis. Which is metal M? A aluminium B copper C iron D silver

8 23 Which of the following substances is classified correctly? substance added to blast furnace main impurity in the iron formed A calcium oxide iron(III) oxide B coke silicon dioxide C limestone carbon D iron(III) oxide silica 24 Elements X, Y and Z are in the same period of the Periodic Table. Oxide of X reacts with both alkali and acid. Oxide of Y dissolves in water to form solution with pH < 7. Solid Z conducts electricity. In which order do the elements appear in the Periodic Table? A X → Y → Z B Y → X → Z C Z → X → Y D Z → Y → X 25 Which of the following properties or reactions shows that substance, X, is an alkali? A On adding dilute hydrochloric acid to X solution, no precipitate is formed. B Solution X dissolves zinc oxide. C Solution X forms brown precipitate when reacted with iron(III) chloride solution. D Solid X gives off ammonia gas when warmed with ammonium chloride. 26 In an experiment, 1 0.0 cm3 of 0.5 mol/dm3 aqueous co