BMSS Prelim P1

Class Index Number Name BUKIT MERAH SECONDARY SCHOOL END-OF-YEAR EXAMINATION 2024 SECONDARY 4 EXPRESS CHEMISTRY 6092/01 Paper 1 Multiple Choice 21 August 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your class, index number and name on all the work you hand in. 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 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. A copy of the Periodic Table is printed on page 18. The use of an approved scientific calculator is expected, where appropriate. This document consists of 17 printed pages and 1 blank page. Setter: Ms Jacqueline How [Turn over

2 JH/BMSS/2024/4EXP/PRELIM/6092/01 [Turn over 1 A gas dissolves readily in water, turns moist blue litmus paper red, and is denser than air. Which set-up should be used to dry and collect this gas? 2 Hexane and water are immiscible liquids. Which method could be used to separate a mixture of hexane and water and how is the purity of the separated hexane checked? method of separation purity check A filtration find the boiling point B filtration by sublimation C use a separating funnel find the boiling point D use a separating funnel by sublimation

3 JH/BMSS/2024/4EXP/PRELIM/6092/01 [Turn over 3 Under the same conditions, which of the following gases would diffuse at the same rate as ethene? 1 carbon monoxide 2 carbon dioxide 3 ethane 4 nitrogen A 1 and 3 only B 1 and 4 only C 2 and 3 only D 2 and 4 only 4 The boiling points of four substances found in air are given in the table. Air is cooled to –190 °C such that some substances condense into liquid. When the temperature is then raised, which liquid would turn into a gas first? substance boiling point / oC A argon –186 B carbon dioxide –78 (sublimes) C nitrogen –196 D oxygen –183 5 Excess aqueous ammonia is added to a solution containing aluminium ions, copper(II) ions and zinc ions. The mixture is then filtered. Which ion(s) will be found in the resulting residue? A aluminium ions B aluminium ions and zinc ions C copper(II) ions D copper(II) ions and zinc ions

4 JH/BMSS/2024/4EXP/PRELIM/6092/01 [Turn over 6 Which reagent(s) can be used to distinguish between aqueous zinc nitrate and aqueous calcium chloride? 1. aqueous sodium carbonate 2. aqueous lead(II) nitrate 3. dilute sulfuric acid A 1 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 7 Which set of three particles have the same total number of electrons? A Cl- Br - I- B F- Ne Na+ C K+ Ca2+ Br- D Li+ Na+ K+ 8 Unknown elements X and Y form an ionic compound X2Y. What is the correct electron arrangement of the atoms X and Y? atom X atom Y A 2, 1 2, 6 B 2, 2 2, 6 C 2, 2 2, 7 D 2, 6 2, 1

5 JH/BMSS/2024/4EXP/PRELIM/6092/01 [Turn over 9 The ‘lead’ in a pencil is made of a mixture of graphite and clay. When the percentage of graphite is increased, the pencil moves across the paper more easily. Which statement explains this observation? A Graphite has a high melting point. B Graphite is a form of carbon C Graphite is a lubricant. D Graphite is a non-metal. 10 A covalent molecule M contains a total of four shared electrons. What is M? A ammonia, NH3 B hydrogen chloride, HCl C methane, CH4 D water, H2O 11 Which diagram represents a solid alloy?

6 JH/BMSS/2024/4EXP/PRELIM/6092/01 [Turn over 12 The diagram shows three balloons filled with different gases. Which statements about the gases in the balloons are correct? 1. The number of moles of gases in the three balloons is different. 2. The number of molecules in the three balloons is the same. 3. The mass of gases in the three balloons is different. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 13 Chlorine gas is a severe irritant to the eyes and respiratory system. The maximum safe toleration of chlorine gas in air is 0.005 mg/dm3. How many molecules of chlorine gas are present in 1 dm3 of air at this toleration level? A 0.005 ÷ 1000 x 1 ÷ 71 x (6 x 10 23) B 0.005 ÷ 71 x (6 x 10 23) C 0.005 ÷ (6 x 10 23) x 71 D 0.005 ÷ 1000 x 71 x (6 x 10 23)

7 JH/BMSS/2024/4EXP/PRELIM/6092/01 [Turn over 14 in an experiment, 12.0 cm3 of propane and 18.0 cm3 of butane are mixed and ignited with a surplus of oxygen, and then allowed to cool to room temperature. The remaining gas is made to flow through an aqueous solution of sodium hydroxide. What is the volume of gas absorbed by the alkali? A 36.0 cm3 B 72.0 cm3 C 108 cm3 D 216 cm3 15 The compound S2O7 reacts with water to produce sulfuric acid and oxygen gas. 2S2O7 + 4H2O → 4H2SO4 + O2 What volume of oxygen, measured at room temperature and pressure, is evolved when 0.704 g of S2O7 reacts with excess water? A 0.0240 dm3 B 0.0480 dm3 C 0.0960 dm3 D 0.192 dm3 16 The equation for the reduction of iron ore in the blast furnace is shown below. When 60 tonnes of the iron ore was reduced, 21 tonnes of molten iron was produced. Fe2O3 + 3CO → 2Fe + 3CO2 What is the percentage yield of this purification process? A 25 % B 50 % C 75 % D 100 %

8 JH/BMSS/2024/4EXP/PRELIM/6092/01 [Turn over 17 What is the relative molecular mass of propanoic acid? A 58 B 60 C 74 D 88 18 Which statement about a dilute solution of a strong acid, HX, is incorrect? A The solution contains hydroxide ions. B The solution contains a low concentration of HX molecules. C The solution contains more water molecules than hydrogen ions. D The solution turns blue litmus paper red. 19 Which equation shows the most suitable reaction for making lead(II) sulfate? A Pb + H2SO4 → PbSO4 + H2 B PbCO3 + H2SO4 → PbSO4 + CO2 + H2O C Pb(NO3)2 + H2SO4 → PbSO4 + 2HNO3 D PbCl2 + H2SO4 → PbSO4 + 2HCl 20 Solid P conducts electricity and has a high melting point. When solid P is warmed with excess dilute hydrochloric acid, it partially dissolves leaving behind a residue. What is P? A brass B copper(II) oxide C graphite D iron

9 JH/BMSS/2024/4EXP/PRELIM/6092/01 [Turn over 21 Which process is a redox reaction? A formation of ammonium sulfate from aqueous ammonia and sulfuric acid. B formation of calcium oxide from calcium carbonate C formation of silver chloride from aqueous silver nitrate and aqueous sodium chloride D formation of sulfuric acid from sulfur dioxide 22 Which row shows the waste products released from the exhaust of a vehicle powered using a hydrogen– oxygen fuel cell? carbon dioxide oxides of nitrogen water A    B    C    D    23 Which pair of electrolyte and electrodes will not result in a change in the concentration of the solution during electrolysis? electrolyte electrodes A copper(II) nitrate carbon B copper(II) nitrate copper C sodium nitrate carbon D sodium nitrate copper

10 JH/BMSS/2024/4EXP/PRELIM/6092/01 [Turn over 24 Two cells were set up as shown in the diagram. The arrows show the direction of electron flow in the external circuits. metal X metal Y metal Z A copper silver zinc B silver copper zinc C silver zinc copper D zinc copper silver 25 Period 3 of the Periodic Table is shown. What increases from Na to Ar across Period 3? A density B melting point C non-metallic character D the number of electron shells 26 The element with proton num