Copy of AMKSS 2024 Chem P1

[Turn Over Candidate Name Form Class Index Number ANG MO KIO SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY FOUR EXPRESS CHEMISTRY 6092/01 Paper 1 Multiple Choice 27 August 2024 1 hour Setter: Mr Vincent Voo 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 name, class and index number on the Question Paper and on the Answer Sheet in the spaces provided. There are forty 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 on this question paper. A copy of the Periodic Table is printed on page 16. The use of an approved scientific calculator is expected, where appropriate. This document consists of 16 printed pages.

2 AMKSS 4E Prelim Exam 6092/01/2024 1 Which apparatus can be used to determine the end-point in a volumetric experiment involving the addition of dilute hydrochloric acid to 25.0 cm3 of aqueous sodium hydroxide? A electronic balance B gas syringe C stopwatch D thermometer 2 Which of the following procedure describes the best method to obtain a pure sample of barium chloride from a mixture of barium chloride and barium sulfate salts? step 1 step 2 step 3 step 4 A dissolution crystallisation filtration evaporation B dissolution filtration evaporation crystallisation C evaporation crystallisation dissolution filtration D filtration dissolution evaporation crystallisation 3 100 cm3 of carbon dioxide gas diffuses through a porous pot in 50 s. 100 cm3 of gas X takes more than 50 s to diffuse through the same porous pot under the same room conditions. Which of the following is gas X? A ammonia B hydrogen C methane D sulfur dioxide 4 Which statement explains why sodium chloride has a lower melting point than magnesium oxide? A Sodium metal is more reactive than magnesium metal. B The attraction between Na+ and Cl− is weaker than that between Mg2+ and O2−. C The boiling point of sodium chloride is lower than that of magnesium oxide. D The bonding in sodium chloride is covalent while it is ionic in magnesium oxide.

3 AMKSS 4E Prelim Exam 6092/01/2024 [Turn Over 5 The diagram shows a molecule of a substance made up of three different elements, P, X and Y. If P is the element phosphorus, what elements could X and Y be? X Y A H O B O Cl C S Na D Mg Na 6 The structure of an ionic compound is as shown. Which compound cannot have this arrangement of its ions? A lithium oxide B magnesium carbonate C potassium chloride D zinc sulfate

4 AMKSS 4E Prelim Exam 6092/01/2024 7 The formula of sodium silicate, which is used in the manufacture of silica gel, is Na2SiO3. What is the formula of magnesium silicate? A MgSiO3 B Mg2SiO3 C Mg(SiO3)2 D Mg3(SiO3)2 8 The table shows the proton number and nucleon number of elements X and Y. element proton number nucleon number X 9 17 Y 13 28 What is the mass of one mole of the compound formed between elements X and Y? A 22 g B 45 g C 79 g D 101 g 9 The mass of mixture M containing barium carbonate and barium sulfate is 8.0 g. Excess nitric acid is added to the mixture and the resulting content is then filtered. The mass of the residue and filtrate is found to be 5.2 g and 13.4 g respectively. What is the percentage purity of barium sulfate in mixture M? A 2.8 8.0 × 100% B 5.2 8.0 × 100% C 5.2 13.4 × 100% D 8.2 13.4 × 100%

5 AMKSS 4E Prelim Exam 6092/01/2024 [Turn Over 10 The complete combustion of ethane is represented by the following equation. C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (l) 60 cm3 of ethane reacts with 120 cm3 of oxygen in a closed container. What is the total volume of gas collected at room temperature at the end of the reaction? A 60 cm3 B 80 cm3 C 100 cm3 D 120 cm3 11 The pH of a sample of dilute hydrochloric acid is 2. What will be the pH of the acid after the addition of 10 g of sodium chloride salt? A pH 1 B pH 2 C pH 7 D pH 9 12 Which of the following set of reactants is most appropriate to prepare a pure sample of copper(II) chloride crystals? A copper and hydrochloric acid B copper(II) carbonate and hydrochloric acid C copper(II) hydroxide and ammonium chloride D copper(II) nitrate and potassium chloride

6 AMKSS 4E Prelim Exam 6092/01/2024 13 Which graph shows the changes in pH as excess dilute hydrochloric acid is added to aqueous sodium hydroxide? A B C D

7 AMKSS 4E Prelim Exam 6092/01/2024 [Turn Over 14 Which of the following will react with aqueous ammonium sulfate to produce an alkaline gas? A calcium hydroxide B copper(II) oxide C nitric acid D sodium chloride 15 In the Haber process, nitrogen and hydrogen react to form ammonia. What is the source of hydrogen? A cracking of oil fractions B electrolysis of water C fractional distillation of liquid air D reaction between acid and metal 16 Which of the following can increase the yield of ammonia in the Haber process? A increase the pressure to 450 atm B increase the temperature to 1000 oC C use equal volume of nitrogen and hydrogen D use platinum as a catalyst 17 Which of the following pairs of solutions will show no visible change when mixed? A barium nitrate and hydrochloric acid B lead(II) nitrate and sodium sulfate C sodium carbonate and magnesium nitrate D zinc and copper(II) sulfate

8 AMKSS 4E Prelim Exam 6092/01/2024 18 A salt has the chemical formula (NH4)2Fe(SO4)2.12H2O. In an experiment, excess sodium hydroxide was added slowly, with shaking, to an aqueous solution of the salt until there is no further changes. The boiling tube was then left to stand. Which of the following observations would not be made? A A green precipitate was produced. B A pungent gas which turned damp red litmus paper blue was produced. C On standing, a brown precipitate was produced. D The precipitate dissolved in excess aqueous sodium hydroxide. 19 Both aqueous sodium carbonate and sodium hydroxide solution turn red litmus paper blue. Which one of the following substances can be used to differentiate the two solutions? A aqueous calcium nitrate B aqueous potassium chloride C carbon dioxide D dilute hydrochloric acid 20 In which reaction is the underlined substance behaving as an oxidising agent? A Cl2 + 2 NaBr → Br2 + 2 NaCl B HCl + NaOH → NaCl + H2O C 2 FeCl2 + Cl2 → 2 FeCl3 D 2 NaOH + FeCl2 → Fe(OH)2 + 2 NaCl 21 In which reaction does the oxidation state of iron remain unchanged? A Fe + 2 FeCl3 → 3 FeCl2 B Fe2O3 + 6 HCl → 2 FeCl3 + 3 H2O C 2 Fe + 3 Cl2 → 2 FeCl3 D 2 FeCl2 + Cl2 → 2 FeCl3

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