IJC H1 CHEM P1

INNOVA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION 2 in preparation for General Certificate of Education Advanced Level Higher 1 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Data Booklet Multiple Choice Answer Sheet 8872/01 24 September 2009 50 minutes 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 thirty 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 11 printed pages and 1 blank page. Innova Junior College [Turn over

2 PRELIM 2  INNOVA 8872/01/09 [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 Consider the following half-equations. Fe 2+ Fe3+ + e C2O4 2– 2CO + 2e 2 What volume of 0.01 mol dm -3 K 2Cr2O7 is required to oxidise 20 cm 3 of an acidified solution of 0.01 mol dm-3 FeC2O4? A 10 cm3 C 30 cm3 B 20 cm3 D 40 cm3 2 A sample containing a mmonium sulphate (M r = 132) was warmed with 100 cm 3 of 0.500 mol dm –3 sodium hydroxide. When the evolution of ammonia ceased, the excess sodium hydroxide solution was neutralised with 25.00 cm 3 of 0.500 mol dm –3 hydrochloric acid. What was the mass of ammonium sulphate in the sample? A 2.48 g C 6.60 g B 4.95 g D 13.20 g 3 A tube was filled with a mixture composing of 10 cm 3 of methane, 15 cm 3 of ethene and 75 cm3 of oxygen at room temperature. The open end of the tube was placed in a beaker of Ba(OH)2 (aq) as shown below. The gas mixture was then sparked and the reaction was allowed to proceed till completion. What would be the final level of the liquid in the tube after cooling it to room temperature? 100 80 60 40 20 Ba(OH)2 (aq) A B C D

3 PRELIM 2  INNOVA 8872/01/09 [Turn over 4 The electro nic configurations of four elements are given below. Which of these elements has the highest first ionisation energy? A 1s2 2s2 2p6 3s1 B 1s2 2s2 2p6 C 1s2 2s2 2p1 D 1s2 2s2 5 Which property of the first seven elements in Period 3 continuously increases numerically? A boiling point B ionic radius C first ionisation energy D highest oxidation number in oxide 6 The first seven ionisation energies of an element W are plotted as below. Which of the following ionisation energies correspond to the removal of the first electron from the s orbital? 0 5000 10000 15000 20000 1234567 no. of electrons removed IE / kJ per mol D B C A 7 The ions P 3–, S 2– and C l – have radii 0.212 nm, 0.184 nm and 0.181 nm respectively. Which one of the following correctly explains the decrease in radius in going from P3– to Cl – ? A An increase in the total number of electrons and in the nuclear charge. B An increase in the total number of electrons with the nuclear charge remaining constant. C A constant total number of electrons and an increase in the nuclear charge. D A decrease in the total number of electrons and an increase in the nuclear charge.

4 PRELIM 2  INNOVA 8872/01/09 [Turn over 8 Which of the following statements is correct for the Period 3 elements Na, Mg, Al, Si, P, S, Cl? A Chlorine has the largest atomic radius B Sodium has the highest electrical conductivity C Cl (g) has the highest first ionisation enthalpy D Cl– (g) and S2– (g) have the same ionic radius 9 Which one of the following statements is incorrect? A AlCl3 has a higher melting point than Al2O3 B Al2Cl6 dimer contains two co-ordinate bonds. C AlCl3 is trigonal planar in shape. D AlCl3 acts as a catalyst in chlorination of benzene. 10 Three substances, X, Y and Z have physical properties as shown. Electrical conductivity in Substance Melting point/ °C Boiling point/ °C solid state liquid state X 801 1413 Poor Good Y 2852 3600 Poor Good Z 3550 4827 Good Not known What could be the identities of X, Y and Z? X Y Z A NaBr CaO SiO 2 B NaCl MgO Graphite C NaF BeCl2 Cu D NaI Al2O3 Diamond 11 In which of the following pairs of compounds is the bond angle in particle I greater than that in particle II? I II A PH3 BH 3 B NO3 − ClO2 − C SF6 ClF3 D I3 - BeCl 2

5 PRELIM 2  INNOVA 8872/01/09 [Turn over 12 The enthalp y change of reaction between zinc and hydrochloric acid can be measured in the laboratory. Zn(s) + 2HCl (aq) ZnCl 2(aq) + H2 (g) What information, other than that obtained in this experiment, is needed to calculate a value for the enthalpy change of formation of aqueous ZnCl 2? A enthalpy change of formation of aqueous H+ and Cl– ions. B enthalpy change of formation of zinc C lattice energy of zinc (II) chloride D first and second ionisation energies of zinc 13 The value of the ionic pr oduct of water, Kw, varies with temperature. Temperature / oC Kw / mol2 dm-6 25 62 1.0 x 10-14 1.0 x 10-13 What can be deduced from this information? A The ionic dissociation of water is an exothermic process. B The association of water molecules by hydrogen bonding increases as temperature increases. C The pH of pure water increases with temperature. D At 62 oC, water with a pH of 6.5 is neutral. 14 Gas X reacts with gas Y according to the following equation X(g) + Y(g) → XY(g) The rate equation for the reaction is rate = k[X][Y] 2 Which of the following statements is correct at constant temperature? A Doubling the concentration of X and of Y, will double the rate of reaction. B Halving the concentration of Y, keeping the concentration of X constant, will decrease the rate by a factor of 8. C Tripling the concentration of both X and Y will increase the rate by a factor of 27. D Quadrupling the concentration of Y, keeping the concentration of X constant, will increase the rate by a factor of 8.

6 PRELIM 2  INNOVA 8872/01/09 [Turn over 15 Ethanedioate ions, C2O4 2–, are oxidised by acidified, aqueous potassium manganate ( VII) according to the equation: 2 MnO4 – (aq) + 5 C2O4 2– (aq) + 16 H+ (aq)  2 Mn2+ (aq) + 10 CO2 (g) + 8 H2O (l) Which of the following graphs would be obtained if the concentration of manganate ( VII) was plotted against time for the reaction? A C B D t [MnO4 -] [MnO4 -] t [MnO4 -] t [MnO4 -] t 16 A mixture of nitrogen monoxide and carbon diox ide will form an equilibrium mixture as shown by the equation. NO (g) + CO2 (g) NO2 (g) + CO (g) If 1.0 mol of nitrogen monoxide and 1.0 mol of carbon dioxide are allowed to reach equilibrium, 20 % of the resulting mixture is nitrogen dioxide. What is the value of the equilibr