RVHS H2 Chem 2013 Prelim P1 QP & Soln

1 River Valley High School 9647/01/PRELIM/13 [Turn over Prelim Examination 2013 Year 6 H2 Chemistry 9647 Paper 1 RIVER VALLEY HIGH SCHOOL YEAR 6 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 6 CENTRE NUMBER S INDEX NUMBER H2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 26 September 2013 1 hour Additional Materials: Mult iple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class, centre number and index number on the Answer Sheet in the spaces provided. 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. ________________________________________________________________________ 1034

2 River Valley High School 9647/01/PRELIM/13 [Turn over Prelim Examination 2013 Year 6 H2 Chemistry 9647 Paper 1 This document consists of 20 printed pages. Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1. In an attempt to establish the formula of an oxide of nitrogen, a known volume of the pure N xOy gas was mixed with hydrogen and passed over a catalyst at a suitable temperature. 100% conversion of the oxide to ammonia and water was known to have taken place. 2400 cm 3 of nitrogen oxide measured at room temperature and pressure produced 7.20 g of water. The ammoni a produced was neutralised by 200 cm 3 of 1.0 mol dm–3 of HCl. What is the formula of the nitrogen oxide? A N2O B N2O2 C N2O4 D NO2 2. In an experiment, 50.0 cm 3 of a 0.100 mol dm −3 solution of a metallic ion, M n+, reacted exactly with 25.0 cm3 of 0.100 mol dm−3 aqueous sodium sulfite. The half-equation for the oxidation of sulfite ion is shown below. SO3 2− (aq) + H2O (l)  SO4 2− (aq) + 2H+ (aq) + 2e− If the final oxidation number of the metal in the salt was +3, what would be the original oxidation number of the metal? A +1 B +2 C +4 D +5 3. Titanium has the electronic structure, 1s 2 2s2 2p6 3s2 3p6 3d2 4s2. Which one of the following compounds is unlikely to exist? A TiO B TiC l3 C K3TiF6 D K2TiO4 1035

3 River Valley High School 9647/01/PRELIM/13 [Turn over Prelim Examination 2013 Year 6 H2 Chemistry 9647 Paper 1 4. Hydrazine, N2H4, and hydrogen peroxide, H 2O2, are both used as rocket propellants because they can produce large volumes of hot gases from a small volume of liquid. Which of the following statements about these two compounds is correct? A The bond angle in N2H4 is smaller than that in H2O2.