MI H2 Chem 2013 Prelim P1 QP

Class Adm No Candidate Name: This document consists of 19 printed pages and 1 blank page. [Turn over 2013 Preliminary Examination II Pre-university 3 H2 CHEMISTRY 9647/01 Paper 1 Multiple Choice Tuesday, 24 Sep 2013 1 hour 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, subject class and registrati on 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. 784

2 Section A For each question there are four possible answers , A, B, C and D. Choose the one you consider to be correct. 1 Which mass of gas would occupy a volume of 3 dm 3 at room temperature and pressure? A 3.2 g O2 gas C 8.0 g SO2 gas B 5.6 g N2 gas D 11.0 g CO2 gas 2 When an excess of K I solution was added to 10.0 cm 3 of a 0.200 mol dm –3 solution of JO4 3–, the iodine liberated was titrated against a standard solution of 0.100 mol dm –3 of sodium thiosulfate, Na2S2O3, using starch as the indicator. 2S2O3 2– + I2  S4O6 2– + 2I– If the volume of sodium thiosulfate required to discharge the blue–black colouration is 40.00 cm 3, what is the final oxidation state of J? A +1 C +3 B +2 D +4 3 The nickel–cadmium rechargeable battery is based on the following overall reaction: Cd + 2NiOOH + 4H2O → Cd(OH)2 + 2Ni(OH)2.H2O What is the oxidation number of nickel at the start and at the end of the reaction? Beginning End A +2 +2 B +2 +3 C +3 +2 D +3 +4 785

[Turn over 3 4 Use of the Data Booklet is relevant to this question. What could be the proton number of an element that has three unpaired electrons in each of its atoms? A 5 C 15 B 13 D 21 5 C 2H4 and C 2H2 are unsaturated hydrocarbons. Which of the following statements is correct regarding these two molecules? A Both C2H4 and C2H2 have the same shape. B C2H4 has more  bonds but fewer  bonds than C2H2. C The carbons in C2H4 and C2H2 are sp and sp2 hybridised respectively. D The carbon–carbon–hydrogen bond angle is larger in C2H4 than in C2H2. 786

4 6 Which graph correctly describes the behaviour of