Copy of 2024 CCHM Chemistry 6092 P1

[Turn over Name: Class: Class Register Number: PRELIMINARY EXAMINATION 2024 SECONDARY 4 CHEMISTRY 6092/01 Paper 1 Multiple Choice 9 September 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 name, class and register number clearly in the spaces provided at the top of this page. 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 16. The use of an approved scientific calculator is expected, where appropriate. This document consists of 16 printed pages.

2 2024 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 1 A student prepares a pure sample of magnesium sulfate from dilute sulfuric acid and magnesium. Which apparatus does the student use? A burette, pipette and an evaporating dish B measuring cylinder and an evaporating dish C beaker, balance, a filter funnel and filter papers D beaker, an evaporating dish, a filter funnel and filter papers 2 A sample of air is passed through the apparatus shown below. What would be the composition of gas A after passing air through aqueous sodium hydroxide and then concentrated sulfuric acid? A carbon dioxide, nitrogen, water vapour B carbon dioxide, nitrogen, oxygen C nitrogen, noble gases, oxygen D noble gases only 3 The chromatogram obtained from a chromatography experiment on substance S is shown. What is the Rf value of S? A 0.35 B 0.48 C 0.56 D 0.62

3 [Turn over 2024 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 4 Three separations are listed. 1. obtaining water from sodium chloride solution 2. obtaining iodine from a mixture of iodine and nickel 3. obtaining solid sodium chloride from aqueous sodium chloride Which techniques would be involved in these separations? 1 2 3 A B C D distillation distillation filtration sublimation sublimation sublimation crystallisation crystallisation evaporation filtration evaporation filtration 5 Some tests are carried out on a sample of water from a factory. The following results were obtained. 1. A white precipitate was formed with barium nitrate and nitric acid. 2. A white precipitate was formed with aqueous ammonia; precipitate was insoluble in excess aqueous ammonia. What compound could be present in the water? A aluminium chloride B aluminium sulfate C zinc chloride D zinc sulfate 6 Element Y burns in air to form an acidic gas that decolourises potassium manganate(VII). What is Y? A carbon B nitrogen C magnesium D sulfur

4 2024 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 7 Solid X was heated until it was completely melted. The graph shows how its temperature varies with time as solid X is heated. Which of the following statements are true about the particles in X? I. They are closer to each other at stage RS than at stage PQ. II. The forces of attraction are stronger at stage P than at stage S. III. The arrangement is more orderly at stage RS than at stage PQ. IV. Their total energy content at stage QR is lower than at stage RS. A II and IV only B II and III only C I and III only D I and II only 8 Which particle contains the same number of both neutrons and electrons? A 𝐶𝑎20 40 2+ B 𝑀𝑔12 24 2+ C 𝐹9 19 − D 𝑆16 32 2− 9 Carbon has three naturally occurring isotopes, carbon-12, carbon-13 and carbon-14. Which of the following statements about carbon-14 is incorrect? A It is found in carbon dioxide in the atmosphere. B It reacts with limited oxygen to form carbon monoxide. C It has different electronic configuration as the other isotopes. D It has the greatest number of neutrons compared to the other isotopes. 10 Which of the following is an element made up of covalent molecules? A ice B iodine C sand D argon

5 [Turn over 2024 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 11 The formula of the nitride of element Q is QN. What is the formula of a compound formed between Q and an oxalate ion, C2O42−? A Q3C2O4 B Q2(C2O4)3 C Q(C2O4)2 D QC2O4 12 The structural diagrams of two molecules, X2Y and ZY2, are shown below. Which of the following represents a molecule of a compound formed between X and Z? A B C D 13 The table below shows some of the physical properties of substance P, Q, R and S. substance melting point /C boiling point /C electrical conductivity Solubility in water solid state liquid state P 122 150 Poor Poor Insoluble Q 690 1790 Poor Good Soluble R 1510 2489 Poor Poor Insoluble S 1453 2730 Good Good Insoluble Which of the following statements about the four substances is correct? A Substances R and Q are macromolecules. B Substance Q can conduct electricity because it has free mobile electrons. C Substance S has a structure held together by electrostatic forces of attraction between positive ions and a ‘sea of delocalised’ electrons. D Substance P has a simple molecular structure, and it has weak forces of attraction between its atoms.

6 2024 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 14 What is the mass of iron in 204 g of Fe2O3? A 56 g B 70 g C 112 g D 143 g 15 Which quantities are the same for one mole of carbon monoxide and one mole of nitrogen monoxide? I. Molar mass II. Number of atoms III. Number of molecules IV. Volume at room temperature and pressure A II, III and IV B I, III and IV C II and III only D III and IV only 16 30 cm3 of 0.1 mol/dm3 of aqueous sodium hydroxide is required to exactly neutralise 25 cm3 of dilute sulfuric acid. What is the concentration of the acid? A 0.24 mol/dm3 B 0.12 mol/dm3 C 0.06 mol/dm3 D 0.03 mol/dm3 17 Tin is extracted from its ore, SnO2, by reducing it with carbon in a furnace. The equation for the reaction is shown below. SnO2 + 2C → Sn + 2CO2 What is the percentage purity of tin ore if 600 g of the tin ore is reduced to produce 82 g of tin? [Ar of Sn: 119, Mr of SnO2: 151] A 82 119 x 151 600 x 100 B 82 119 x 600 151 x 100 C 119 82 x 151 600 x 100 D 82 600 x 100

7 [Turn over 2024 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 18 A hydrocarbon was found to contain 85.7% by mass of carbon and 14.3% by mass of hydrogen. The molar mass of the hydrocarbon was found to be 56 g/mol. What is the molecular formula of the hydrocarbon? A CH2 B C2H4 C C3H8 D C4H8 19 A piece of blue litmus paper was soaked in concentrated aqueous sodium chloride 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 and then bleached B remain blue remain blue C turn red turn red and then bleached D turn red and then bleached remain blue 20 The diagram below shows the set-up of an electric cell using electrodes of copper and metal T. Which statement is correct? A Copper is less reactive than metal T. B Effervescence will be observed at metal T. C Oxidation occurs at metal T. D The mass of copper electrode will increase over time.

8 2024 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 21 Electrolysis is use