2022 BGSS Chem Prelims P1

©BGSS 2015 Name: Register Number: Class: 4E BEDOK GREEN SECONDARY SCHOOL Preliminary Examination 2022 4E Chemistry 6092/1 Paper 1 30 Aug 2022 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class on the multiple choice answer sheet provided. There are forty questions in this paper. Answer all questions. For each question, there are four possible answers, A, B, C and D. Choose the one you consider to be correct and record your choice in soft pencil on the optical mark sheet. Read very carefully the instructions on the Multiple Choice Answer Sheet. INFORMATION FOR CANDIDATES Each correct answer will score one mark. Any rough working should be done in this booklet. A copy of the Periodic Table is on Page 16. This document consists of 16 printed pages including the cover page. © BGSS 2022 No part of this document may be reproduced in any form or transmitted in any form or by any means without the prior permission of Bedok Green Secondary School. [Turn Over ��

©BGSS 2022 2 Section A: Multiple Choice Questions [40 marks] Answer all questions on the Multiple Choice Answer Sheet. 1 The apparatus consists of a porous pot containing a gas X which is surrounded by a gas Y in a gas jar. Which of the following pairs of gases would cause an upward movement of the liquid in the right hand limb of the U-tube? gas X gas Y A H2 NH3 B NH3 CO2 C O2 H2 D O2 CO2 2 Aqueous lead(II) nitrate and aqueous potassium iodide are added to a dish containing water, as shown. A yellow precipitate forms after a few minute. Which process occurs before the precipitate forms? A diffusion B distillation C precipitation D neutralisation Y X gas jar U-tube containing an inert liquid aqueous lead(II) nitrate aqueous potassium iodide yellow precipitate porous pot ��

©BGSS 2022 3 3 Oxygen was prepared from hydrogen peroxide and collected as shown in the diagram. The first few tubes of gas were rejected because the gas was contaminated by A nitrogen. B hydrogen. C water vapour. D hydrogen peroxide. 4 The results of a paper chromatography experiment shown below were obtained. Given that the Rf value of dye P is 0.40, determine the Rf value of dye Q. A 0.50 B 0.60 C 0.70 D 0.80 solvent front dye Q dye P 2.4 cm 3.6 cm start line ink sample aqueous hydrogen peroxide oxygen water manganese(IV) oxide ��

©BGSS 2022 4 5 Which of the following properties cannot be used to test for the purity of a coloured liquid? A filtration B freezing point C fractional distillation D paper chromatography 6 The electronic structure of two atoms P and Q are shown below. When these two elements combine chemically, what will be the type of bonding and mass of one mole of the compound formed? type of bonding mass of one mole of compound I g A ionic bonding 43 B covalent bonding 70 C ionic bonding 102 D covalent bonding 113 7 An atom of element X has a proton number of 6 and nucleon number 16. Which of the statements about X is correct? A An oxide of X is likely to be basic. B The formula of a molecule of X is likely to be X2. C The formula of the compound formed by X and hydrogen is XH2. D X is likely to form four covalent bonds and a giant covalent structure. 13 p 14 n 8 p 8 n atom P atom Q ��

©BGSS 2022 5 8 A metal consists of a lattice of positive ions in a ‘sea’ of electrons. What changes, if any, take place to the ‘sea’ of electrons and positive ions in a metal wire when an electric current is passed through it? electrons positive ions A replaced by new electrons replaced by new electrons B replaced by new electrons unchanged C unchanged replaced by new electrons D unchanged unchanged 9 Fibre glass can be considered to be a mixture of ionic oxides and giant covalent oxides. Which of the following is not a constituent of fibre glass? A MgO B Na2O C P4O10 D SiO2 10 Melamine is a plastic. It has an empirical formula of CH2N2. If its relative molecular mass is 126, what is its molecular formula? A CH2N2 B C2H4N4 C C3H6N6 D C4H8N8 11 One mole of each of the following compounds is burnt in excess oxygen. Which compound will produce two moles of carbon dioxide and two moles of steam only? A C2H4 B C3H8 C C2H5OH D C2H5COOH ��

©BGSS 2022 6 12 The fertiliser ammonium nitrate is manufactured from ammonia by a two-stage process. Stage 1: NH3 + 2O2 à HNO3 + H2O Stage 2: HNO3 + NH3 à NH4NO3 What is the maximum mass of fertiliser that can be made if only 17 tonnes of ammonia is available? A 34 tonnes B 40 tonnes C 80 tonnes D 97 tonnes 13 68 g of impure hydrogen peroxide decomposes in the presence of manganese(IV) oxide to give 1.2 dm3 of oxygen gas at room temperature and pressure. 2H2O2 à O2 + 2H2O What is the percentage purity of the hydrogen peroxide? A 2.5% B 5.0% C 10.0% D 15.0% 14 One mole of compound X gives three moles of ions in aqueous solution. X reacts with ammonium carbonate to give an acidic gas. What is compound X? A sulfuric acid B ethanoic acid C calcium hydroxide D sodium hydroxide 15 In which pair of substances, does each have a giant molecular structure? A methane, silica B diamond, silica C diamond, iodine D iodine, methane ��

©BGSS 2022 7 16 Which of the following salts is incorrectly matched with its method of preparation? salt method of preparation A silver nitrate add excess silver to warm dilute nitric acid B ammonium sulfate titrate aqueous ammonia with dilute sulfuric acid C lead(II) chloride mix aqueous lead(II) nitrate and dilute hydrochloric acid D iron(III) sulfate add excess iron(III) oxide to warm dilute sulfuric acid 17 Which one of the following is not a redox reaction? A Mg + 2HCl à MgCl2 + H2 B Mg(OH)2 + 2HCl à MgCl2 + 2H2O C Cu + 2H2SO4 à CuSO4 + 2H2O + SO2 D Cu + 4HNO3 à Cu(NO3)2 + 2H2O + 2NO2 18 What is the role of hydrogen peroxide as shown in the reaction? Ag2O + H2O2 à 2Ag + H2O + O2 A a catalyst B a reducing agent C an oxidising agent D a dehydrating agent 19 Lead(II) oxide is reduced in the apparatus shown. How do the masses of parts X and Y of the apparatus change? X Y A decreases decreases B decreases increases C increases decreases D increases increases drying agent heat part X hydrogen part Y lead(II) oxide excess of hydrogen ��

©BGSS 2022 8 20 A 25 cm3 of phosphoric acid, H3PO4, contains 0.025 mole of the acid. What is the hydrogen ion concentration in the solution? A 0.25 mol/dm3 B 1.00 mol/dm3 C 2.00 mol/dm3 D 3.00 mol/dm3 21 The carbonate of metal X is a white solid. It decomposes when heated. Carbon dioxide and a yellow solid oxide are formed. What is metal X? A iron B lead C copper D sodium 22 The diagram shows apparatus for measuring the volume of hydrogen given off when an excess of dilute hydrochloric acid is added to powdered metal. The volume of gas is measured at room temperature and pressure. The experiment is carried out three times, using the same mass of powder each time but with different powders: • pure magnesium • pure zinc • a mixture of magnesium and zinc Which powder gives the greatest volume of hydrogen and which the least volume? greatest volume of H2 least volume of H2 A magnesium zinc B magnesium the mixture C zinc magnesium D zinc the mixture dilute hydrochloric acid tap metallic powder water graduated tube ��

©BGSS 2022 9 23 The table shows the results of adding weighed pieces of nickel metal in salt solutions of metals P, Q, R and S. solution initial mass of nickel /g m