2022 NYGH Chem Prelims P1

Class Centre/Index Number Name Preliminary Examination 2022 Secondary 4 CHEMISTRY Paper 1 Multiple Choice 6092/01 1 hour Friday 26 August 1200 – 1300 Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue, correction fluid or tape. Write your name, register number and class in the spaces at the top of this page 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 in this booklet. A copy of the Periodic Table is printed on page 15. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages and 1 blank page. Setter(s): FKD NANYANG GIRLS' HIGH SCHOOL [Turn over ���

2 1 Which apparatus would be most suitable for measuring 24.5 cm3 of a liquid? A burette B measuring cylinder C pipette D syringe 2 The diagram shows an experimental setup to produce and collect a dry sample of gas X. Which of the following is most likely to be gas X? A ammonia gas B hydrogen gas C hydrogen chloride gas D steam 3 Which is not correctly matched with the apparatus needed for each separation? separation apparatus A oil from a mixture of oil and water separating funnel B salt from a mixture of salt and sand filter paper, filter funnel, evaporating dish, retort stand, Bunsen burner C blue dye from black ink filter paper, beaker, lid D water from seawater thermometer, fractionating column, condenser gas X concentrated sulfuric acid ���

3 [Turn over 4 The graph shows the solubility curve of potassium nitrate in water. Potassium nitrate solid was dissolved in 400 g of water at 45°C to obtain a saturated solution. Upon cooling the solution to room temperature (25°C), what is the maximum approximate mass of crystals that can be obtained? A 113 g B 138 g C 452 g D 552 g 5 Which of the following tests would be able to distinguish between sulfur dioxide and carbon dioxide gas? 1 Bubble the gas into a test tube containing aqueous acidified KMnO4. 2 Bubble the gas into a test tube containing limewater. 3 Place a damp blue litmus paper over the gas. 4 Place a lighted splint over the gas. A 1 only B 1 and 2 C 1 and 3 D 2 and 4 0 10 20 30 40 50 temperature / °C 250 200 150 100 50 0 solubility / g per 100 g of water ���

4 6 A student carried out an experiment, at room temperature, involving two gas jars filled with equal volumes of nitrogen dioxide gas and bromine gas respectively. The gas jars are sealed with a lid and placed below another gas jar containing air. The student removed the lids at the same time and observed that the gas jar containing nitrogen dioxide gas fills up the other gas jar more quickly than the gas jar containing bromine gas. What could be the possible explanation to the difference in the rate of diffusion? A Bromine has a higher boiling point than nitrogen dioxide. B Nitrogen dioxide has greater kinetic energy than bromine gas. C Nitrogen dioxide has smaller molecular mass than bromine gas. D There are more atoms in a molecule of nitrogen dioxide than in a bromine molecule. 7 An element from the Periodic Table has the following properties.  It has x number of protons and x+1 number of neutrons.  It forms an ion with x+3 number of electrons. Which element is this most likely to be? A aluminium B boron C nitrogen D phosphorus air lid nitrogen dioxide bromine ���

5 [Turn over 8 Some properties of substance Y are listed.  It has a high melting point.  It does not conduct electricity in solid state.  When fluorine gas is bubbled into its solution, a brown solution is obtained. Which of the following is a possible identity of Y? A calcium chloride B graphite C potassium iodide D sodium 9 Epsom salts contain magnesium sulfate and are often used as a natural remedy for muscle aches, inflammation, and stress. A student wrote down some statements about magnesium sulfate. 1 It is made up of a giant lattice structure. 2 Strong electrostatic forces of attraction exist between Mg2+, S2− and O2− ions. 3 There is both ionic and covalent bonding present. 4 The ratio of positive to negative ions is 1:2. Which of the above statements are correct? A 1 and 2 B 1 and 3 C 2 and 4 D 1, 3 and 4 10 Dihydrogen tetrahydride has the following structure. What is the total number of valence electrons not involved in bonding? A 2 B 4 C 6 D 8 ���

6 11 Which of the following enables a metal to conduct electricity? A atoms B electrons C ions D protons 12 Vanillin is the main chemical compound present in vanilla bean extract. It contains 63.16 % of carbon, 5.26 % of hydrogen and 31.58 % of oxygen by mass. What is the empirical formula of vanillin? A C3H3O B C5H5O2 C C8H8O3 D C8H8O6 13 Four moles of sulfur dioxide reacted with three moles of oxygen gas according to the following equation at room temperature and pressure. 2SO2(g) + O2(g) → 2SO3(g) What is the total volume of gas in the reaction mixture after the reaction is complete? A 48.0 dm3 B 72.0 dm3 C 96.0 dm3 D 120 dm3 ���

7 [Turn over 14 When 12.4 g of copper(II) carbonate, CuCO3, was heated, 20 cm3 of carbon dioxide gas, measured at room temperature and pressure, was released. What was the percentage yield of carbon dioxide? A 0.833 % B 4.17% C 41.7 % D 83.3 % 15 Three electrochemical cells are set up using zinc metal and three other unknown metals P, Q and R as electrodes. The results of the experiment are shown in the table below. metal tested voltmeter reading / V direction of electron flow P Q R 0.200 0.500 1.100 zinc to metal P metal Q to zinc zinc to metal R Which of the following shows the three unknown metals in increasing order of reactivity? A P, Q, R B Q, P, R C R, P, Q D R, Q, P 16 A piece of blue litmus paper was soaked in dilute aqueous potassium bromide and supported on a glass slide. The paper was connected to an electrical supply as shown in the diagram. Which of the following shows the correct observations near each electrode after some time? negative electrode positive electrode A remain blue turn red B remain blue turn red and then bleached C turn red remain blue D turn red and then bleached remain blue glass slide negative electrode positive electrode blue litmus paper soaked in dilute aqueous potassium bromide ���

8 17 Which of the following would involve overall energy being released? A action of light on silver bromide B conversion of water to steam C rusting of iron D thermal decomposition of calcium carbonate 18 When 17.75 g of Cl2 is reacted with excess H2, 45.5 kJ of energy is given out according to the following equation. H2 + Cl2 → 2HCl What is the enthalpy change, ∆H, for the reaction? A +91 B −91 C +182 D −182 19 100 cm3 of 1 mol/dm 3 dilute hydrochloric acid reacted with an excess of magnesium ribbon to produce hydrogen gas according to the equation below. The volume of hydrogen gas produced was recorded against time in experiment 1. 2HCl + Mg → MgCl2 + H2 What could be the quantities of ac