2024 EJC H1 Chemistry Prelims P1 QP

© EJC [Turn Over EUNOIA JUNIOR COLLEGE JC2 Preliminary Examination 2024 General Certificate of Education Advanced Level Higher 1 CHEMISTRY Paper 1 Multiple Choice 8873/01 18 September 2024 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, civics group and registration 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 question paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 11 printed pages and 1 blank page.

2 © EJC 8873/01/J2Prelims/24 1 Use of the Data Booklet is relevant to this question. In the analysis of an oxide of nitrogen, NxOy, 0.10 mol of the oxide were reacted with excess hydrogen under suitable conditions. 32 2 N O xNH H OH xy y⎯⎯⎯ → + 3.6 g of water were formed in this reaction, while the ammonia produced required 100 cm3 of 1.0 mol dm–3 HCl(aq) for neutralisation. What is the formula of the oxide of nitrogen analysed? A NO B NO2 C N2O D N2O5 2 The isotopic composition of an element is shown. What is the Ar of the element? A 10.2 B 10.5 C 10.8 D 11.0 5 4 3 2 1 0 relative abundance 9 10 11 12 mass number of isotopes

3 © EJC 8873/01/J2Prelims/24 [Turn over 3 Three chemical reactions involving hydrogen peroxide, H2O2, are shown. reaction 1 H2O2 + 2HI → 2H2O + I2 reaction 2 5H2O2 + 2KMnO4 + 3H2SO4 → 5O2 + 2MnSO4 + 8H2O + K2SO4 reaction 3 2H2O2 → 2H2O + O2 Which row identifies the reaction in which the oxygen of hydrogen peroxide undergoes oxidation, reduction and disproportionation? oxidation reduction disproportionation A reaction 1 reaction 2 reaction 3 B reaction 2 reaction 1 reaction 3 C reaction 2 reaction 3 reaction 1 D reaction 3 reaction 1 reaction 2 4 The table below shows the composition of the nucleus in some particles. particle number of neutrons number of nucleons P– 21 40 Q+ 18 38 R2– 19 39 S2+ 20 41 Which of the following pairs consists of particles that are isoelectronic? A Q+ and R2– B Q+ and S2+ C P– and R2– D R2– and S2+ 5 When a beam of protons travelling at the same speed passes through an electric field of constant strength, the protons, 1H+, are deflected through an angle of +15º. Under identical conditions, which particle would be deflected through an angle of +5º? A 2H+ B 3He2+ C 6Li2+ D 12C3+