Dunman 2026 S4 Pure Chem 6092 Prelim P1

This document consists of 17 printed pages and 1 blank page. DUNMAN SECONDARY SCHOOL CANDIDATE NAME CLASS INDEX NUMBER PRELIMINARY EXAMINATION 2026 SECONDARY 4 EXPRESS CHEMISTRY 6092/01 Paper 1 28 August 2026 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 name, class and index number on the Answer Sheet in the spaces provided unless this has been done for you. 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 in this booklet. A copy of the Periodic Table is printed on page 17. The use of an approved scientific calculator is expected, where appropriate.

2 6092/01/Prelim/4Exp/2026 1 Which statement about chromatography is correct? A Each substance has its own unique Rf value in chromatography. B Locating agents are needed to identify the colours present in ink. C The start line has to be below the solvent level. D The Rf value is a ratio of the distance travelled by a component to the solvent front. 2 The diagrams show two methods of gas collection. Which pair of gases can be collected by both methods? A ammonia and hydrogen B carbon dioxide and sulfur dioxide C hydrogen and methane D nitrogen and hydrogen chloride 3 In a change of state at constant temperature and pressure: ● energy is released as stronger forces of attraction form between the particles ● the average distance between the particles changes very little. Which change of state is being described? A boiling B condensation C freezing D melting method 1 method 2 measuring cylinder water gas gas

3 6092/01/Prelim/4Exp/2026 4 Four gases are listed. 1 CH4 2 NH3 3 N2O 4 HCl What is the order of their rate of diffusion at room temperature and pressure? fastest slowest A 1 2 4 3 B 2 1 3 4 C 3 4 2 1 D 4 1 3 2 5 The boiling points of some of the substances found in air are given in the table. Air is cooled to -200oC. Which substance will turn into a gas first as the temperature is raised? substance boiling point/oC argon neon nitrogen oxygen -186 -246 -196 -183 A argon B neon C nitrogen D oxygen 6 Two ions, strontium and bromide have the symbols Sr2+ 38 88 and Br-35 81 respectively. Which statement about these ions is correct? A The strontium ion has seven more neutrons than the bromide ion. B The strontium ion has two more protons than the bromide ion. C They contain the same number of electrons. D They form a compound with formula Sr2Br.

4 6092/01/Prelim/4Exp/2026 7 A pure sample of element X has a relative atomic mass of 51.8. The sample consists of three isotopes. The table shows the relative masses and percentage abundances of two of the isotopes. isotope relative mass of isotope percentage abundance of isotope 1 2 50 52 40 40 Which statement is true about the isotopes? 1 The isotopes have different densities. 2 The relative mass of the third isotope is 55. 3 The isotope with the smallest relative mass reacts most readily. A 1 only B 1 and 2 C 2 and 3 D 1, 2 and 3 8 The diagram shows a ‘dot-and-cross’ diagram, showing outer shell electrons only, of a molecule of tetrafluorosilane, SiF4. Which statement is correct? A Each molecule of SiF4 has 12 unbonded pairs of electrons. B In SiF4, both silicon and fluorine atoms achieve the same electronic configuration as neon. C Molten SiF4 is a poor conductor of electricity. D Weak bonds between silicon and fluorine result in a low melting point for SiF4.

5 6092/01/Prelim/4Exp/2026 9 Atoms of element Q form positive ions. An ion of Q has 10 electrons and 10 neutrons. Which statement about Q is correct? 1 A An atom of Q has only two occupied electron shells. B Q forms ionic compounds with elements in Groups 17 and 18. C The atomic number of Q less than 10. D The mass number of Q is greater than 20. 10 Element Z has a lattice of positive ions and a ‘sea of electrons’. Z forms ions with formula, Z3+. What can be deduced about Z? A Atoms of Z has three times the number of electrons as protons. B It conducts electricity through mobile positive ions and electrons. C It forms strong ionic bonds when it combines other elements to form an alloy. D It remains chemically unchanged when an electric current passes through it. 11 Which row contains the same amount of substance under room temperature and pressure? substance 1 substance 2 A 12 dm3 argon 12 dm3 water B 16 g oxygen 6.02 x 1023 molecules of oxygen C 24 dm3 nitrogen 6.02 x 1023 atoms of nitrogen D 24 dm3 neon 24 g magnesium

6 6092/01/Prelim/4Exp/2026 12 20 cm3 of nitrogen monoxide gas is mixed with x cm3 of oxygen gas. The equation for this reaction is shown. 2NO(g) + O2(g) → 2NO2(g) All the nitrogen monoxide is reacted. The total volume of gas at the end of the reaction is 40 cm3. All measurements are at room temperature and pressure. What is the value of x? A 10 cm3 B 20 cm3 C 30 cm3 D 40 cm3 13 The molar mass of an organic compound W is 60 g/mol. W contains 40.0% carbon, 6.70% hydrogen and 53.3% oxygen. Which statement about W is correct? 1 The empirical formula of W is C2H4O2. 2 There are 12 g of carbon in 0.5 mole of W. 3 W could be ethanoic acid. 4 W could be methyl methanoate. A 1, 2 and 3 B 1 and 3 C 2 and 3 D 2, 3 and 4 14 A mixture of sodium hydrogencarbonate and sodium chloride is heated. The equation for the reaction that takes place when sodium hydrogencarbonate is heated is shown. 2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) Impurities of sodium chloride is stable to heat. When 9.0 g of the mixture is heated, the loss in mass is 2.25 g. What is the percentage by mass of sodium hydrogencarbonate in the mixture? [Mr: NaHCO3, 84; Na2CO3, 106; CO2, 44; H2O, 18; NaCl, 58.5] A 34% B 48% C 68% D 95%

7 6092/01/Prelim/4Exp/2026 15 Which statement about hydrochloric acid and ethanoic acid is correct? A Hydrochloric acid reacts with sodium hydroxide but ethanoic acid does not. B Hydrochloric acid undergoes complete ionisation in water but ethanoic acid does not ionise at all. C The pH of 1 mol/dm3 ethanoic acid is higher than the pH of 1 mol/dm3 hydrochloric acid. D 1 mol/dm3 hydrochloric acid gives a greater total volume of gas than 1 mol/dm3 ethanoic acid when reacted with the same mass of calcium carbonate. 16 Which method would not produce ammonia? A compressing hydrogen and nitrogen under high heat in the presence of an iron catalyst B heating ammonium sulfate with hydrochloric acid C heating an alkaline solution containing calcium nitrate and aluminium powder D warming concentrated aqueous ammonia 17 Hydrazine has the formula H2NNH2. It has similar properties to ammonia. Which property will hydrazine have? A It dissolves in water to produce hydrogen ions. B It has weak intermolecular forces between nitrogen and hydrogen atoms. C It reacts with hydrogen chloride to form a compound with formula ClH3NNH3Cl. D It reacts with sodium hydroxide to form a soluble salt. 18 The table gives some statements about acids and bases and explanations for these statements. Which row shows either an incorrect statement or an incorrect exp