SAJC_2008 H2_Prelims_P1

ST ANDREW’S JUNIOR COLLEGE JC2 Preliminary Examinations CHEMISTRY Higher 2 9746/01 Paper 1 Multiple Choice 11 September 2008 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, Centre number and candidate number on the Answer Sheet in the spaces provided unless this has been done for you. There are fourty 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 20 printed pages including this page.

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 experiment, 15 cm3 of a hydrocarbon underwent complete combustion in 75 cm3 of oxygen. The final gaseous mixture contained 30 cm3 of carbon dioxide and 30 cm3 of unreacted oxygen. All gaseous volumes were measured under room temperature and pressure. What is the molecular formula of the hydrocarbon? A CH4 B C2H4 C C2H6 D C3H6 2. 50.0 cm3 of 0.0500 mol dm-3 KClO4(aq) requires 50.0 cm3 of 0.200 mol dm-3 TiCl3(aq) to reach end-point. Given that Ti(III) is oxidized to Ti(IV) in this reaction, what is the oxidation state of the reduced product of the ClO4 - ion? A -1 B +1 C +3 D +5 3. A flask L containing an unknown volume of neon gas at a pressure of 2 kPa was connected to a flask M containing 3 dm 3 of helium gas at 4 kPa. The final pressure in the connected flasks was found to be 3.5 kPa. What was the volume of flask L, assuming that the temperature was constant throughout? A 1.0 dm3 B 1.5 dm3 C 2.0 dm3 D 2.5 dm3 [Turn Over - 2 -

4. Particle Number of neutrons Number of nucleons Q- 16 33 R+ 19 39 S2- 17 33 T2+ 18 35 Which of the following pairs consists of particles that are isoelectronic? A Q- and S2- B R+ and S2- C S2- and T2+ D Q- and T2+ 5. An element X has the electronic configuration [Kr] 4d 10 5s2 5p3. What is the likely formula for the fluoride of X? A X3F B XF2 C XF5 D XF6 6. Which of the following ions will be deflected the most when passed through an electric field? A +Na23 11 B −2 16 8 O C +2 24 12 Mg D −Cl35 17 [Turn Over - 3 -

7. Which of the following molecules is linear? A Cl-S-Cl B O=N-Br C H-O-O-H D O=C=C=C=O 8. Which of the following sets of compounds all contain the same type of forces of attraction between molecules of their own? A CO2, NO2, SO2 B NaCl, MgCl2, AlCl3 C BF3, CH4, SF6 D