PJC_H1_CHEM_P1

Name: Index No.: CT Group: 08 PIONEER JUNIOR COLLEGE, SINGAPORE JC2 PRELIMINARY EXAMINATIONS HIGHER 1 CHEMISTRY 8872/01 Paper 1 Multiple Choice 24 September 2009 50 minutes Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, Centre number and index number 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. This document consists of 10 printed pages. © PJC 2009 8872/01/Prelim/S/09

2 Section A For each question, there ar e four possible answers, A , B, C and D. Choose the one you consider to be correct. 1 What is the minimum volume of air required for complete combustion of 10 cm 3 of a hydrocarbon, C3H4? (Assume that air contains one-fi fth oxygen by volume and that both gas volumes are measured at the same temperature and pressure.) A 40 cm 3 B 50 cm 3 C 200 cm 3 D 250 cm 3 2 What are the oxidation st ates of chlorine in these three chlorine compounds? chlorine compounds NaC l NaCl O NaC lO 3 A -1 +1 +5 B +1 -1 +5 C +1 -1 +7 D +2 -1 +7 3 Consider the following half-equations. MnO 4 - + 8H+ + 5e- → Mn2+ + 4H2O Fe2+ → Fe3+ + e- C2O4 2- → 2CO2 + 2e- What volume of 0.01 mol dm -3 KMnO4 is required to oxidise 15 cm 3 of an acidified solution of 0.01 mol dm-3 FeC2O4? A 6 cm 3 B 9 cm 3 C 15 cm 3 D 25 cm 3 4 What is the relative energy between the 3d and the 4s subshells in chlorine atom and chromium atom respectively? chlorine atom chromium atom A relative energy between 3d and 4s subshell 4s > 3d 4 s > 3d B relative energy between 3d and 4s subshell 4s > 3d 4 s < 3d C relative energy between 3d and 4s subshell 4s < 3d 4 s > 3d D relative energy between 3d and 4s subshell 4s < 3d 4 s < 3d © PJC 2009 8872/01/Prelim/S/09

3 5 What is the bond angle of O – C – O in CO 3 2- ion? A 180 o B 120 o C 109.5 o D 107 o 6 In which of the following pairs do the molecules have similar shapes? A BeCl 2 and H2O B BF 3 and NH3 C CO 2 and SO2 D AlCl3 and BCl3 7 Use of the Data Booklet is relevant to this question. What is the enthalpy change of reaction of the following reaction? N 2H4(g) + 2F2(g) → N2(g) + 4HF(g) A -1206 kJ mol -1 B -372 kJ mol -1 C +372 kJ mol -1 D +1206 kJ mol -1