ACJC_H1_CHEM_P1

ANGLO-CHINESE JUNIOR COLLEGE DEPARTMENT OF CHEMISTRY Preliminary Examination CHEMISTRY 8872/01 Higher 1 Paper 1 Multiple Choice 02 September 2015 50 minutes 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 fluids. Write your name, index number and tutorial class on the Answer Sheet in the spaces provided unless this has been done for you. 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 14 printed pages and 2 blank pages. 8872/Prelims/15 ANGLO-CHINESE JUNIOR COLLEGE © ACJC 2015 Department of Chemistry [Turn over

© ACJC 2015 8872/01/Prelim/15 [Turn over 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 Tetraarsenic trisulfide, As4S3 is used as a maintenance therapy for newly diagnosed acute leukemia. It reacts with oxygen to produce an oxide of arsenic in the +5 oxidation state and an oxide of sulfur in the +4 oxidation state. How many moles of oxygen gas are needed to burn two moles of As4S3? A 7.5 B 8 C 15 D 16 2 In an experiment, 33.40 cm 3 of a 0.150 mol dm −3 solution of a metallic ion, M n+, reacted exactly with 50.0 cm3 of 0.050 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 +2 B +3 C +4 D +5 3 Titanium has the electronic structure, 1s2 2s2 2p6 3s2 3p6 3d2 4s2. Which one of the following compound is NOT likely to exist? A TiN B KTiO4 C TiS D Na3TiF6

© ACJC 2007 9746/01/Prelim/07 [Turn over 3 4 The successive ionisation energies, in kJ mol–1, of an element X are given below. 1010 2265 3662 4998 7002 8992 28698 32215 Which one of the following would best represent the formula of the ionic compound formed by X? A XBr B XO2 C MgX2 D K2X 5 Which molecule has the largest dipole? A B C D 6 Which of the following pairs of subst