IJC H2 CHEM MCQ ANS

1 INNOVA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION 2 in preparation for General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Data Booklet Multiple Choice Answer Sheet 9647/01 14 September 2011 1 hour READ THESE INSTRUCTIONS FIRST Write your name and class on all the work you hand in. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. This document consists of 15 printed pages and 1 blank page. Innova Junior College [Turn over

2 PRELIM 2  INNOVA 9647/01/2011 [Turn Over Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 0.5 g of zinc powder was found to reduce an acidified solution of 25.50 cm 3 of 0.200 mol dm-3 metal A ion, AO2 +. What is the final oxidation number of metal A? A 0 C +2 B +1 D +3 2 Which graph is obtained when pV is plotted against p for a fixed amount of an ideal gas at constant temperature? A C B D 3 Gaseous particle B has a proton number n and a charge of +1. Gaseous particle C has a proton number of (n+1) and is isoelectronic with B. B and C have the same number of neutrons. Which of the following statements incorrectly describes B and C? A The charge of B is half that of C. B B has a larger ionic radius than C. C B requires less energy than C when a further electron is removed from each particle. D B has a higher charge density than C.

3 PRELIM 2  INNOVA 9647/01/2011 [Turn Over 4 The use of the Data Booklet is relevant to this question. D and E are in Group V and Group VI respectively. Which of the following comparisons between the first and second ionisation energies of D and E is correct? 1st I.E. 2 nd I.E. A D < E D > E B D < E D < E C D > E D > E D D > E D < E 5 Three substances F, G and H have physical properties as shown. Substance Melting point/ °C Boiling point/ °C Electrical conductivity of solid of liquid F 801 1413 Poor Good G 2852 3600 Poor Good H 3550 4827 Good Unknown What could be the identities of F, G and H? F G H A AlCl3 NaCl C (diamond) B AlCl3 MgO C (graphite) C NaCl MgO C (graphite) D NaCl MgO C (diamond) 6 Which one of the following pairs contains substances with a similar shape? A CO2 and I3 - B NH3 and NO3 - C BeCl2 and SnCl2 D BCl3 and PCl3

4 PRELIM 2  INNOVA 9647/01/2011 [Turn Over 7 One of the key production stages in the Contact Process is the production of sulfur trioxide by the reaction below: 2SO2(g) + O2(g) 2SO 3(g) The rate constants of the forward and backward reactions are given as k1 and k-1 respectively. What happens to the equilibrium constant Kc, k1 and k-1 if the volume of the reaction vessel is decreased at constant temperature at equilibrium? k 1 k-1 Kc A increases increases increases B unchanged increases unchanged C increases increases decreases D unchanged unchanged unchanged 8 The graphs below show how the percentage of gaseous products present at equilibrium vary with temperature and pressure. Which one of the following reactions could the graph represent? A H 2(g) + I2(g) 2H I (g) H = +53 kJ mol-1 B N2(g) + 3H2(g) 2NH 3(g) H = –92 kJ mol-1 C N2O4(g) 2NO 2(g) H = +57 kJ mol-1 D C(s) + O2(g) CO 2(g) H = –394 kJ mol-1 9 The use of the Data Booklet is relevant to this question. Given the following enthalpy changes, Mg(s) Mg 2+(g) + 2e ∆H = +2353 kJ mol-1 ½ O2(g) + 2e O 2-(g) ∆H = +897 kJ mol-1 Which of the following statements is incorrect? A The sum of the first and second ionisation energies of magnesium is +2353 kJ mol-1. B The sum of the first and second electron affinities of oxygen is +649 kJ mol-1. C The enthalpy change of atomisation of magnesium is +167 kJ mol-1. D The enthalpy change of formation of Mg2+(g) is +2353 kJ mol-1. % products at equilibrium pressure (T + 10) oC T oC

5 PRELIM 2  INNOVA 9647/01/2011 [Turn Over 10 An experiment was conducted to determine the efficiency of the heating of a can of water using a spirit burner. The following data were recorded: Mass of ethanol burnt = m g Change in temperature of water = ∆T oC You are also given that: Relative molecular mass of ethanol = 46.0 Enthalpy change of combustion of ethanol = –1371 kJ mol −1 Specific heat capacity of water = c J g−1 K−1 Which expression below gives the efficiency of this heating process? A %m .∆Tc 10010001371 046300   C %m ∆Tc 1001371 0.46300   B %.∆Tcm 10010001371300 046   D %.∆Tc m 100046300 10001371   11 The solubility products of silver chloride and silver carbonate at 25 oC are 2 x 10 –10 mol2 dm-6 and 8 x 10–12 mol3 dm-9 respectively. Which of the following statements is not true? A When silver nitrate is added into a 1 dm3 solution containing 0.01 mol of chloride and 0.01 mol of carbonate ions, silver chloride precipitates out first. B Silver chloride has a lower molar solubility than silver carbonate. C Addition of hydrochloric acid increases the solubility of silver carbonate. D Addition of sodium chloride to a solution containing silver chloride decreases the solubility product of silver chloride. thermometer can containing 300 g of water burner containing ethanol

6 PRELIM 2  INNOVA 9647/01/2011 [Turn Over 12 The following graph shows the pH changes when a 0.10 mol dm-3 solution of J is added to 20.0 cm3 of 0.10 mol dm-3 of sulfuric acid. Which of the following statements regarding the titration is correct? A J is a weak monoprotic base. B There are no buffer regions in this graph. C Phenolphthalein is a suitable indicator for this titration, but not methyl orange. D At point Y, the salt at end point is hydrolysed to give an acidic solution. 13 Consider the sequence of oxides Na2O, SiO2, P4O10. Which factor decreases from Na2O to SiO2 and also from SiO2 to P4O10? A covalent character C pH when mixed with water B Electrical conductivity in the solid state D solubility in aqueous alkali 14 The following shows the variation of a property of the first 20 elements in the Periodic Table with the atomic number of the element. What is the property? A Atomic radius C Ionic radius B First ionisation energy D Melting point pH Volume of J / cm3 Z Y X 1 7 13 20 40 60

7 PRELIM 2  INNOVA 9647/01/2011 [Tu