TJC H2 Chem 2012 Prelim P1 QP

1 CHEMISTRY 9647/01 Paper 1 Multiple Choice Wednesday 19th September 2012 1 hour Candidates answer on separate paper. Additional materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, Civics Group and index number on the Answer Sheet in the spaces provided unless this has been done for you. 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 17 printed pages and 1 blank page 9647/01/TJC Prelim 2012 [Turn over

2 9647/01/TJC Prelim 2012 [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 If a mixture of 0.4 g hydrogen and 9.6 g oxygen is exploded, wha t will be the volume of the remaining gas at room temperature and pressure? A 0.60 dm3 B 1.20 dm3 C 2.40 dm3 D 4.80 dm3 2 Which of the following contains two isoelectronic species? A NH4+ and BH3 B NH4+ and CH4 C BF3 and NH3 D PF5 and BF4- 3 For a given mass of an ideal gas, which of the following graphs display a different shape from the rest? A PV against V (at constant T) B V/T against T (at constant P) C 1/density against T (at constant P) D PV against P (at constant T) 4 25.0 cm3 of 0.0200 mol dm-3 of yellow FA1 solution reacts with x g of zinc and the latter is oxidised to Zn2+. The resulting solution required 15.0 cm3 of 0.0200 mol dm-3 of acidified KMnO4 to restore its original colour. Find x. A 0.0196 g B 0.0218 g C 0.0327 g D 0.0491 g

3 9647/01/TJC Prelim 2012 [Turn over 5 An aqueous sample containing the following anions is analysed. Cl− CO32− SO42− In which order should the reagents be added to determine the amount of chloride in the sample? [If a precipitate is formed, filtration process is carried out before the addition of the next reagent to the filtrate.] Reagent 1 R eagent 2 Reagent 3 A AgNO3 HNO3 Ba(NO3)2 B HNO3 Pb(NO3)2 AgNO3 C HNO3 Ba(NO3)2 AgNO3 D Ba(NO3)2 NH3 AgNO3 6 The successive ionisation energies (IE) of two elements X and Y, are given below: IE / kJ mol-1 1st 2 nd 3 rd 4 th 5 th 6 th 7 th 8 th X 786 1580 3230 4360 16000 20000 23600 29100 Y 1251 2298 3822 5158 6542 9330 11000 33604 The c ompound formed when X and Y combine is most likely to be A i onic, with formula X2Y B ionic, with formula XY2 C covalent, with formula XY4 D covalent, with formula X2Y5

4 9647/01/TJC Prelim 2012 [Turn over 7 The reaction between ph