NSS Chem Part 3 Metals MC

NSS Chemistry Part 3 MetalsHKCEE Past Paper Questions – Multiple Choice Questions1. 1995 Q5Which of the following methods can be used to extract lead from lead(II) oxide?A.heating lead(II) oxide in the absence of airB.heating lead(II) oxide in the presence of airC.heating lead(II) oxide with copper at high temperatureD.heating lead(II) oxide with carbon at high temperatureAns: D 2. 1995 Q6Which of the following fertilizers contains the largest percentage by mass of nitrogen?(Relative atomic mass : H = 1.0, N = 14.0, O = 16.0, Na = 23.0, S = 32.0, Cl = 35.5, K = 39.0)A.ammonium chlorideB.ammonium sulphateC.potassium nitrateD. sodium nitrateAns: A3. 1995 Q18Metal X reacts with dilute hydrochloric acid to liberate hydrogen, but metal Y and metal Z have no reaction with the dilute acid. The oxide of metal Y decomposes on heating but the oxide of metal Z does not. Which of the following arrangement represents the order of increasing reactivity of the three metals?A.X < Y < ZB.Y < Z < XC.X < Z < YD.Z < Y < XAns: BA certain amount of silver oxide is he plot of the mass of the contents of theA.C.5. 1996 Q8Zinc blocks are often attached to the s A. zinc can protect steel from corrosi B. zinc is more resistant to corrosion C. zinc is harder than steel. D. zinc does not react with crude oil.6. 1996 Q12Consider the following experiment :After the experiment, the residue in obtained. X may be A. carbon. B. magnesium. C. silver. D. sulphur.e is heated in a test tube. Which of the following grap of the test tube against time?B.D.o the steel legs of off-share oil platforms because orrosion. osion than steel. de oil.ent :ue in the combustion tube is dissolved in water and g graphs represents the correct Ans: CAns: Aer and an alkaline solution is Ans: BWhich of the following statements concerning one mole of nitrogen gas is/are correct?(1)It has a mass of 14.0 g.(2)It occupies the same volume as 4.0 g of helium gas at room temperature and pressure.(3)It contains 6.02×1023 atoms of nitrogen.(Relative atomic masses : He = 4.0, N = 14.0; Avogadro constant = 6.02×1023 mol–1)A.(1) onlyB.(2) onlyC.(1) and (3) onlyD.(2) and (3) onlyAns: B 8. 1997 Q10Which of the following combinations in INCORRECT?Chemical Method of storageA. calcium under waterB. potassium under paraffin oilC. ethanol in a cool placeD. potassium permanganate in a brown bottlesolutionAns: A 9. 1997 Q28What mass of copper is obtained when 0.40 mol of copper(II) oxide are completely reduced by carbon?(Relative atomic masses : O = 16.0, Cu = 63.5)A.12.7 gB.15.9 gC.25.4 gD.31.8 gAns: C10. 1997 Q32Which of the following metal oxides can be reduced to the metal when heated with carbon?(1)aluminium oxide(2)lead(II) oxide(3)iron(III) oxideA.(1) onlyB.(2) onlyC.(1) and (3) onlyD. (2) and (3) onlyAns: DOne mole of sulphur atoms has a mass twice that of one mole of oxygen atoms. Which of the following statement is/are correct?(1)2 g of sulphur and 1 g of oxygen each occupy the same volume at room temperature and pressure.(2)2 g of sulphur and 1 g of oxygen each contain the same number of atoms.(3)The number of atoms contained in one mole of sulphur is twice that contained in one mole of oxygen.A.(1) onlyB.(2) onlyC.(1) and (3) onlyD.(2) and (3) onlyAns: B 12. 1997 Q41Aluminium is used to make window frames because(1)it is strong.(2)it can resist corrosion.(3)it is the most abundant metallic element in the earth crust.Which of the above statements are correct?A.(1) and (2) onlyB.(1) and (3) onlyC.(2) and (3) onlyD.(1), (2) and (3)Ans: A13. 1998 Q10The formula for hydrated iron(II) sulphate is FeSO4⋅xH2O. On strong heating, 20.1 g of the sulphate produces9.1 g of water. What is the value of x?(Relative atomic masses : H = 1.0, O = 16.0, S = 32.1, Fe = 56.0)A. 5B. 6C.7D.8Ans: CConsider the following experiment.During the experiment, a gas is liberat A.copper. B.lead. C. silver. D. zinc.15. 1998 Q19In each of the four solutions shown be Which of the following combinationsTubeObservation A. Ino change B. II brown coating on zinc C. IIIno changeD. IVgrey coating on zinc 16. 1998 Q20 The following equation represents thePb 3O 4(s) + 4H 2(g) 3Pb (s) + 4H What mass of lead would be obtained(Relative atomic mass : O = 16.0, Pb =A. 20.7 g B. 41.4 g C. 62.1 g D. 82.8 gent.iberated. The gas can burn at the end of the delivery tu wn below, a strip of zinc is added.tions is correct? n zinc zincts the reaction of an oxide of lead with hydrogen: + 4H 2O (l)ained if 68.5 g of the oxide was consumed in the reacti 0, Pb = 207.0) ery tube. X is probably Ans: DAns: Creaction? Ans: CIron can be produced from iron(III) oxide by the following reaction:Fe2O3(s) + 3CO(g) 2Fe(s) + 3CO2(g)What mass of iron(III) oxide is required to produce 2.1 g of iron?(Relative atomic masses: O = 16.0, Fe = 56.0)A. 3.0 gB. 4.5 gC. 6.0 gD.9.0 gAns: A18. 1999 Q17The compound X2S contains 58.9% of X by mass. What is the relative atomic mass of X?(Relative atomic mass : S = 32.1)A.11.5B.23.0C.39.0D.46.0Ans: B19. 1999 Q18Which of the following processes would NOT produce hydrogen gas?A.adding calcium to waterB.adding magnesium to dilute hydrochloric acidC.adding copper to dilute nitric acidD.passing steam over red hot ironAns: C20. 1999 Q22In which of the following situations is iron prevented from rusting by sacrificial protection?A.Iron plates are joined together with copper rivets.B.Iron pipes are connected to lead blocks.C.Iron sheets are plated with zinc.D.Iron cans are coated with tin.Ans: CWhich of the following reactions will occur when aluminium powder is added to silver nitrate solution?(1)displacement(2)anodization(3)redoxA.(1) onlyB.(2) onlyC.(1) and (3) onlyD.(2) and (3) onlyAns: C22. 2000 Q3Iron cans used for canning food are usually coated with tin instead of zinc. This is becauseA.tin is more reactive than zinc.B.tin ions are non-toxic but zinc ions are toxic.C.tin forms an alloy with iron and this alloy is corrosion resistant.D.tin prevents iron cans from rusting by sacrificial protection.Ans: B 23. 2000 Q4Metal X forms an oxide. 27.53 g of this oxide contains 24.96 g of X. What is the mole ratio of X to oxygen in the oxide?(Relative atomic masses: O = 16.0, X = 207.0)A. 1 : 1B. 1 : 2C. 2 : 3D. 3 : 4Ans: D24. 2000 Q33In an experiment, a piece of calcium metal was added to a beaker of water. Which of the following statements concerning the experiment is/are correct?(1)The calcium metal sank to the bottom of the beaker.(2)The calcium metal burnt with a brick red flame.(3)At the end of the experiment, an alkaline solution was formed in the beaker.A.(1) onlyB.(2) onlyC.(1) and (3) onlyD.(2) and (3) onlyAns: CConsider the reaction;4H 2(g) + Fe 3O 4(s) 3Fe (s) + 4H What mass of iron would be obtained consumed in the reaction?(Relative atomic mass : Fe = 56.0; mo A. 0.056 g B. 0.084 g C. 0.168 g D. 0.224 g26. 2001 Q26What is the percentage by mass of chr (Relative atomic mass : O = 16.0, K =A. 17.7 B. 25.1 C. 35.4 D. 40.827. 2001 Q30 Which iron nail in the test tubes showA.B.C.D.2O(l)tained if 96.0 cm 3 of hydrogen, measured at room tem 0; molar volume of gas at room temperature and press of chromium in potassium dichromate? 0, K = 39.1, Cr = 52.0) shown below would rust most slowly? B.D.m temperature and pressure, is pressure = 24 dm 3) Ans: CAns: CAns: CWhich of the following statement correctly describe(s) the advantages(s) of using aluminium over iron to make soft drink cans?(1)Aluminium is stronger than iron.(2)Aluminium is less dense than iron.(3)Aluminium is more corrosion-resistant than iron.A.(1) onlyB.(2) onlyC.(1) and (3) onlyD.(2) and (3) onlyAns: D29. 2001 Q38In which of the following experiments would a metal be produced?(1)heating silver oxide(2)heating iron pyrite(3)heating a mixture of lead(II) oxide and carbon powderA.(1) and (2) onlyB.(1) and (3) onlyC.(2) and (3) onlyD.(1), (2) and (3)Ans: B 30. 2002 Q3An oxide of element X has the formula X2O3. 10.2 g of this oxide contains 5.4 g of X. What is the relative atomic mass of X?(Relative atomic mass : O = 16.0)A.12.0B.18.0C.27.0D.36.0Ans: C31. 2002 Q8Which of the following statements concerning aluminium is correct?A.Aluminium is used to make stainless steel.B.The strength of aluminium can be enhanced by anodization.C.Aluminium is the most abundant element in the earth’s crust.D.When aluminium is exposed to air, a layer of aluminium oxide is formed on its surface.Ans: DAmmonium dichromate, (NH4)2Cr2O7, decomposes on heating to give chromium(III) oxide, water and nitrogen.What mass of water is obtained when 126 g of ammonium dichromate undergoes complete decomposition?(Relative atomic masses : H = 1.0, N = 14.0, O = 16.0, Cr = 52.0)A.9 gB.18 gC.36 gD.72 gAns: C33. 2002 Q26When a piece of copper is dropped into an aqueous solution of compound X, the copper gradually dissolves. X is probablyA.magnesium chloride.B.lead(II) nitrate.C.silver nitrate.D.ammonium chloride.Ans: C34. 2002 Q27Which of the following objects is least likely to contain titanium?A.missileB.water tapC.bicycle frameD.artificial hip jointAns: B 35. 2003 Q3When a small piece of calcium metal is put into a trough of water, a reaction occurs. Which of the following statements concerning this reaction is correct?A. It is an endothermic reactionB. It is a redox reactionC. A slight explosion occurs.D. The calcium metal burns spontaneously in water.Ans: B36. 2003 Q5Which of the following methods can be used to obtain aluminium from aluminium oxide?A. reducing the oxide with carbonB. heating the oxide strongly.C. electrolysis of the molten oxideD. heating the oxide with iron powder.Ans: CWhich iron nail in the beakers shownA.C.38. 2003 Q11A sample of MgSO 4⋅xH 2O (s) of mass 1(Relative atomic masses: H = 1.0,A.4 B.5 C.6 D. 739. 2003 Q42Iron pyrite (FeS 2) looks like gold and be used to distinguish iron pyrite from (1) comparing their densities(2) comparing their electrical conduct (3) comparing the effect of heat on thA. (1) and (2) onlyB. (1) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)hown below would undergo corrosion most readily?B.D.mass 123.2 g contains 63.0 g of water of crystallization = 1.0, O = 16.0, Mg = 24.3, S = 32.1) d and its common name is “fool’s gold”. Which of th e from gold? onductivity on themAns: Bzation. What is the value of x? Ans: Dof the following methods can Ans: DThe relative atomic masses of hydrogen and oxygen are 1.0 and 16.0 respectively. Which of the following statements concerning 36.0 g of water is correct?(Molar volume of gas at room temperature and pressure = 24 dm3; Avogadro constant = 6.02×1023 mol-1)A. It contains 4 mol of hydrogen atoms.B. It contains 3×6.02×1023atomsC. It contains 6×6.02×1023 molecules.D. It has a volume of 48 dm3 at room temperature and pressure.Ans: A41. 2004 Q12The relative atomic mass of element X is 7439. It forms an oxide containing 24.3 % of oxygen by mass. What is the mole ratio of X to oxygen in the oxide?(Relative atomic mass: O = 16.0)A. 1:2B. 1:3C. 2:3D. 2:5Ans: C 42. 2004 Q16Magnesium can be obtained from magnesium oxide byA. electrolysis of the molten oxide.B. heating the oxide strongly.C. heating the oxide with carbon.D. heating the oxide with zinc powder.Ans: A43. 2004 Q26What is the percentage by mass of nitrogen in the fertilizer (NH4)2HPO4?(Relative atomic masses: H = 1.0, N = 14.0, O = 16.0, P = 31.0)A. 10.6 %B. 12.3 %C. 21.2 %D. 24.6 %Ans: CDirections : Questions 44 and 45 refer to the following experiment.Rust indicator solution was poured into the following glass dishes to cover the iron nails, which were wrapped with different metal strips. The dishes were allowed to stand in air for some time.silver strip dish 1zinc strip dish 2copper strip dish 3magnesium stripdish 444. If the iron nail rusts, what would the colour of the rust indicator be around the nail ?A. yellowB. brownC. redD. blueAns: D45. In which of the dishes would the iron nail rust?A. dish 1 onlyB. dish 2 onlyC. dish 1 and dish 3 onlyD. dish 2 and dish 4 onlyAns: C46. 2005 Q36Which of the following properties of Group I elements decreases down the group?A. melting pointB. reducing powerC. reactivityD. tendency to form cationsAns: AMethane burns completely in oxygen according to the following equation:CH 4 + 2O 2 → CO 2 + 2H 2OWhat is the mass of oxygen required for the complete combustion of 48 g of methane? (Relative atomic mass: H = 1.0, C = 12.0, O = 16.0) A. 48 g B. 96 g C. 192 g D. 384 gAns: C48. 2006 Q9Which of the following properties is considered the most important one when choosing an alloy for making fuse in electric plugs?A. low melting pointB. high electricity conductivityC. good ductilityD. high mechanical strengthAns: A49. 2006 Q13X and Y are two different metals. Which of the following shows that Y is more reactive than X ?A. X forms an ion with a charge of +2 while Y forms an ion with a charge of +1.B. X reacts with dilute hydrochloric acid but Y does not.C. X can displace Y from an aqueous solution of a salt of Y .D.The oxide of X undergoes decomposition upon strong heating but the oxide of Y does not.Ans: D50. 2006 Q18Element X forms two oxides XO and XO 2. If 1 mole of XO contains n atoms, 2 moles of XO 2 would contain A.23n atoms. B. 2n atoms. C. 3n atoms. D. 6n atoms.Ans: CThe relative atomic mass of metal X is 55.8. 23.90 g of X is allowed to react with excess oxygen until X is completely oxidised. The mass of the metal oxide obtained is 34.18 g. What is the empirical formula of the oxide?(Relative atomic mass: O = 16.0)A. XOB. X2O3C. X3O2D. X3O4Ans: B 52. 2006 Q41Metal X forms an oxide with the formula X2O. Upon strong heating, the oxide undergoes decomposition according to the following equation:2X2O(s) → 4X(s) + O2(g)Complete decomposition of 2.90 g of the oxide gives 150 cm3 of oxygen, measured at room temperature and pressure. What is the relative atomic mass of X?(Relative atomic mass: O = 16.0;molar volume of gas at room temperature and pressure = 24 dm3)A. 54.0B. 108.0C. 216.0D. 232.0Ans: B 53. 2007 Q7X, Y and Z are metals. The table below shows the observations when each of them is put into copper(II) sulphate solution:Metal ObservationX no observable changeY brown solid formed and colourless gas evolvedZ brown solid formedWhich of the following arrangements correctly represents the ascending order of reactivity of the metals?A.X < Z < YB.Y < Z < XC.Z < X < YD.X < Y < ZAns: AHow many moles of ethane contain y hydrogen atoms?(L represents the Avogardo’s constant.)A.y / LB.L / yC.y / 6LD.6y / LAns: C55. 2007 Q34What mass of iron can be obtained by complete reduction of 7.18 g of iron(III) oxide?(Relative atomic masses: Fe = 55.87, O = 16.0)A. 2.51 gB. 3.86 gC. 5.02 gD. 5.58 gAns: C 56. 2007 Q35Different metals are dropped into water or dilute hydrochloric acid. Assuming that the experimentalconditions are the same, which of the following comparisons concerning the initial rates of hydrogenformation is correct?Initial rate of hydrogenformation Initial rate of hydrogenformationA. Ca and H2O > Ba and HClB. Fe and HCl > K and H2OC. K and H2O > Cs and H2OD. Cs and H2O > Ca and H2OAns: D57. 2008 Q12Green patches appear on the surface of a metallic statue in a museum. It can be deduced that the statue may containA. tin.B. iron.C. silver.D. copper.Ans: DThe oxidation number of metal M in its oxide is +2. Complete reduction of 11.9 g of this oxide by hydrogen gas produces metal M and 2.7 g of water. What is the relative atomic mass of M ? (Relative atomic masses : H = 1.0, O = 16.0) A. 9.3 B. 24.3 C. 63.3 D. 137.3Ans: C59. 2008 Q20 A small piece of potassium is dropped into a trough of water containing methyl orange. Which of the following observations is / are correct?(1) The potassium moves about on the water surface with a hissing sound. (2) The potassium dissolves in water and the solution turns red. (3) The potassium burns with a golden yellow flame. A. (1) only B. (2) only C. (1) and (3) onlyD. (2) and (3) onlyAns: A60. 2008 Q31 Organic compound Q has the following composition by mass : C : 37.5%H : 12.5%O : 50.0%What is the possible chemical formula of Q ? (Relative atomic masses : H = 1.0, C = 12.0, O = 16.0) A. OH CH 3 B. OH H C 52 C. HCOOH D.COOH CH 3Ans: A61. 2008 Q34 From which of the following processes can lead be obtained in a school laboratory? A. Lead(II) oxide is heated strongly. B. Lead(II) oxide is mixed with carbon. C. Dilute lead(II) nitrate solution is electroylsed. D. Zinc is added to dilute lead(II) nitrate solution.Ans: DWhat is the percentage by mass of oxygen in Na2CO3‧10H2O?(Relative atomic masses: H = 1.0, C = 12.0, O = 16.0, Na = 23.0)A. 72.7B. 55.9C. 22.4D. 16.8Ans: A 63. 2009 Q6Which of the following rust prevention methods does NOT match with the iron-made object?Rust prevention method Iron-made objectA. painting gateB. greasing machinery partsC. zinc plating food canD. chromium plating car bumperAns: C 64. 2009 Q20Which of the following half equations are involved when iron rusts?(1) Fe → Fe3++3e－(2) Fe → Fe2++2e－(3) Fe2+ → Fe3++e－A. (1) and (2) onlyB. (1) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)Ans: C 65. 2009 Q33An oxide of metal M reacts completely with carbon to give 12.6 g of metal M and 2.38 dm3 of carbon dioxide measured at room temperature and pressure. What is the chemical formula of the oxide?(Relative atomic masses: M=63.5, O= 16.0;Molar volume of gas at room temperature and pressure = 24 dm3)A. M OB. M O2C. M2OD. M2O3Ans: AAnodised aluminium is more commonly used than iron for making window frames. This is because(1) the cost for extracting aluminium is lower than the cost for extracting iron.(2) anodised aluminium is more corrosion resistant than iron.(3) anodised aluminium is harder than iron.A. (1) onlyB. (2) onlyC. (1) and (3) onlyD. (2) and (3) onlyAns: B67. 2009 Q46Which of the following information is needed in order to deduce the molecular formula of a compound from its empirical formula?(l) relative molecular mass of the compound(2) percentage by mass of each constituent element(3) relative atomic mass of each constituent elementA. (1) and (2) onlyB. (1) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)Ans: B68. 2009 Q47Which of the following statements concerning the anodisation of an aluminium object are correct?(1) The electrolyte used can be dilute sulphuric acid.(2) A layer of aluminium oxide is formed on the surface of the object.(3) The aluminium object should be connected to the negative terminal of the power supply.A. (1) and (2) onlyB. (1) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)Ans: A69. 2010 Q14What mass of methane upon complete combustion gives 0.90 g of water ?(Relative atomic masses: H= 1.0, C= 12.0, O = 16.0)A. 0.40 gB. 0.45 gC. 0.75 gD. 0.80 gAns: AThe oxide of metal Z reacts with dilute hydrochloric acid to form a colourless solution. Which of the following metals may Z be?(1) zinc(2) copper(3) silverA. (1) onlyB. (2) onlyC. (1) and (3) onlyD. (2) and (3) onlyAns: A71. 2010 Q26Which of the following safety measures should be taken when investigating the reaction between sodium and water ?(1) Use forceps to pick sodium.(2) Use a small piece of sodium.(3) Use a small amount of water.A. (1) and (2) onlyB. (1) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)Ans: A72. 2010 Q33A certain oxide of manganese contains 49.5% of manganese by mass. What is the empirical formula of thisoxide ?(Relative atomic masses : O = 16.0, Mn = 54.9)A. MnOB. MnO2C. Mn2O3D. Mn2O7Ans: D。