2022 ACSI Chemistry Prelim Paper 1

1 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2022 [Turn over Anglo-Chinese School (Independent) Year 4 Express Preliminary Examination 2022 CHEMISTRY PAPER 1 Multiple Choice 6092/1 Wednesday 24th August 2022 1 hour Additional materials: Calculator Multiple Choice answer sheet Soft clean eraser Soft pencil (type 2B recommended) INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Write and shade the candidate number on the answer sheet in the spaces 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 correct and record your choice in soft pencil on the separate answer sheet. INFORMATION FOR CANDIDATES 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. You may use a calculator. A copy of the Periodic Table is printed on page 17. This question paper consists of 17 printed pages.

2 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2022 [Turn over 1 A student conducted an experiment by heating some ammonium chloride, NH4Cl, in a test tube. He tested the gases coming out of the tube with moist litmus papers. Which statement describes the observation made by the student regarding the experiment? A Both litmus papers changed colour at the same time. B The blue litmus paper turned red first. C The red litmus paper turned blue first. D There is no change in the colour of both litmus papers. 2 The diagram below shows two separate chromatograms. Both chromatograms were conducted using the same solvent. The chromatogram on the left shows four unknown sugars, A, B, C and D. The chromatogram on the right shows glucose and was stopped earlier than the one on the left which caused the solvent front to be lower. Which sugar, A, B, C and D, is glucose? solid ammonium chloride blue litmus paper red litmus paper heat solvent front starting line solvent front starting line A B C D

3 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2022 [Turn over 3 At which temperatures does seawater freezes and boils at sea level? freezes at boils at A 2oC 102oC B 2oC 98oC C - 2oC 102oC D - 2oC 98oC 4 Which of the following contains an element, a mixture and a compound? A water, seawater, table salt B air, petrol, carbon dioxide C silver, tungsten, magnesium oxide D titanium, steel, rust 5 Titanium has five stable isotopes and shows three oxidation states, +2, +3 and +4. Below is an ion formed from the most abundant isotope. 𝑇𝑇𝑇𝑇22 48 4+ Which of the following shows the number of protons, neutrons and electrons of an ion formed by a different isotope of titanium? protons neutrons electrons A 22 26 19 B 18 22 22 C 22 28 20 D 22 24 17

4 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2022 [Turn over 6 Which of the following substances contain delocalized electrons? 1 graphite 2 molten sodium oxide 3 aqueous copper(II) sulfate 4 water 5 aluminium A 1 only B 1 and 5 only C 2 and 3 only D 3 and 4 only 7 The structural formula of formyl chloride, CHClO, is as shown: How many electrons are not involved in bonding in a molecule of CHClO? A 10 B 12 C 16 D 24 8 Substance X has a melting point of 1710oC and does not conduct electricity in any states. It is also insoluble in any solvent. What could be the identity of substance X be? A aluminium oxide B silicon dioxide C mercury D carbon dioxide

5 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2022 [Turn over 9 In a pathology laboratory, a sample of urine containing 0.120 g of urea, NH 2CONH2, was treated with 25.0 cm 3 of 0.750 mol/dm3 of nitrous acid. The urea reacted according to the equation below: NH2CONH2 + 2HNO2 → CO2 + 2N2 + 3H2O The gas produced was passed through aqueous sodium hydroxide and the final volume measured. What was the final volume of gas left behind, measured at room temperature and pressure? A 9.60 cm3 B 14.4 cm3 C 48.0 cm3 D 96.0 cm3 10 Which of the following has the same number of oxygen atoms/ions as 21.93 g of aluminium oxide? A 4.95 g of lithium oxide B 15.6 g of iron(III) oxide C 7.74 dm3 of nitrogen dioxide gas D 12.2 dm3 of carbon monoxide gas 11 A chloride of an unknown transition metal Z has the formula ZCl3. 32.5 g of Z Cl3 was added to water to form an aqueous solution of Z Cl3. It was found that 300 cm3 of 2.0 mol/dm 3 aqueous silver nitrate was required to precipitate all the chloride ions. What is the relative atomic mass of metal Z? A 11 B 27 C 56 D 114

6 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2022 [Turn over 12 Which of the following reactions does not show hydrochloric acid behaving as an acid? A 2HCl + Mg → MgCl2 + H2 B 2HCl + CaCO3 → CaCl2 + CO2 + H2O C HCl + AgNO3 → AgCl + HNO3 D 2HCl + Na2O → 2NaCl + H2O 13 How many moles of hydrogen ions are present in 50 cm3 of 1 mol/dm3 sulfuric acid? A 0.01 mol B 0.05 mol C 0.10 mol D 1.00 mol 14 Three substances were added, separately, to sodium chloride and sodium sulfate solutions. The three substances were 1 aqueous barium nitrate 2 aqueous ammonia 3 dilute nitric acid Which substance(s), when added separately, can be used to distinguish between sodium chloride and sodium sulfate? A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3

7 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2022 [Turn over 15 Aqueous sodium hydroxide was added to a sample of aqueous iron(II) chloride and left to stand. The reaction was observed over a period of time. 1 A green precipitate was formed. 2 A reddish-brown precipitate was formed. 3 The precipitate increased in mass over time. Which of the observation(s) above would be true over a period of time? A 1 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 16 In an experiment, 8.0 cm3 of 1 mol/dm3 of sodium hydroxide solution is added to 6.0 cm3 of 1 mol/dm 3 of copper( II) sulfate solution. What will be observed by the student after the reaction? A a colourless solution only B a blue precipitate and a blue solution C a blue precipitate and a colourless solution D a white precipitate and a colourless solution 17 A pale green solution G forms a green precipitate with excess aqueous sodium hydroxide. An alkaline gas is given off when the mixture is warmed with powdered aluminium. What is the identity of G? A iron(II) nitrate B ammonium nitrate C copper(II) chloride D ammonium chloride

8 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2022 [Turn over 18 What is the oxidation state of vanadium in vanadyl sulfate, VOSO4? A + 2 B - 2 C + 4 D - 4 19 Disproportionation is a reaction in which the same element is both oxidized and reduced. Which reaction is an example of disproportionation? A 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O B Cl2 + 2NaOH → NaCl + NaOCl + H2O C Fe2(SO4)3 + 2KI → 2FeSO4 + K2SO4 + I2 D 2Pb(NO3)2 → 2PbO + 4NO2 + O2 20 Which of the following correctly states the product(s) formed and the type of energy generated by a hydrogen fuel cell? product(s) formed type of energy generated A water chemic