MSHS 2024 Chem Prelim P1

Class/ Index Number / Centre Number/ ‘O’ Level Index Number / Name MARIS STELLA HIGH SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR CHEMISTRY 6092/01 Paper 1 Multiple Choice 28 August 2024 1 hour Additional Materials: Optical Test Answer Sheet (OTAS) – 1 sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your class, index number, Centre number, O level index number and name in the spaces 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 answer 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 question booklet. A copy of the Periodic Table is printed on page 17. The use of an approved scientific calculator is expected, where appropriate. The total number of marks for this paper is 40. At the end of the examination, hand in the following separately: (1) Optical Test Answer Sheet (OTAS) (2) Question Paper This document consists of 17 printed pages.

2 1 A gaseous mixture of oxygen, sulfur dioxide and propene are passed through the apparatus shown below. Only one gas is collected. What is the property of the gas collected? A turns moist blue litmus red. B relights a glowing splint. C burns with a yellow flame. D turns acidified potassium manganate(VII) solution colourless. 2 An experiment was conducted to compare the diffusion of gas X and gas Y. Which pair of gases could be X and Y that will cause a decrease in the water level at P? gas X gas Y A B C D carbon monoxide fluorine methane nitrogen fluorine neon oxygen carbon dioxide gas Y gas X water level at P

3 3 A series of experiments were conducted on a substance. Which observation suggests that the substance cannot be an element? A It has a fixed melting point. B It forms two oxides when heated in air. C It produces one spot on the chromatogram. D It forms two products when the molten substance undergoes electrolysis. 4 The Rf values of some substances in ethanol are shown below. substance Rf value X 0.20 Y 0.80 Z 0.45 Which of the following cannot be concluded from the Rf value of X? A X is less soluble in ethanol than Y and Z. B X will also have the same Rf value when the solvent used is water. C The distance travelled by Y is four times the distance travelled by X. D The distance travelled by X is one-fifth the distance travelled by ethanol.

4 5 Diagrams W, X and Y show how the particles of a substance are packed at different temperatures. W X Y 6 The graph below shows the temperature changes which occur upon warming the substance. In which region of the graph would all the particles be packed as in Y? Ethanol has the structure shown. How many of the electrons in a molecule of ethanol are not involved in bonding? A 6 B 8 C 10 D 12 temperature time

5 7 An element X has an electronic configuration 2 .1. The compound formed when X combines with oxygen is most likely to be A a liquid at room temperature. B a compound with a low melting point. C a good conductor of electricity in both solid and molten states. D a solid that dissolves in water to form an electrolyte. 8 Scientists have discovered the use of an isotope of lead, Pb, which can treat non -cancerous eye disorders. 210Pb is an isotope of 207Pb. Which statement about these isotopes is correct? A 210Pb atom has 210 neutrons but 207Pb atom has 207 neutrons. B 210Pb atom and 207Pb atom have 125 protons each. C 210Pb atom has 3 neutrons more than 207Pb atom. D 210Pb atom has 3 protons more than 207Pb atom. 9 Buckminsterfullerene is a form of carbon. The diagram shows the structure of a molecule of buckminsterfullerene, which is made up of 60 carbon atoms. Which of the following would most likely be the properties of buckminsterfullerene? melting point solubility in water electrical conductivity as a solid A B C D high high low low insoluble soluble insoluble soluble good poor good poor

6 10 Which statement best explains why calcium oxide has a higher melting point than potassium bromide? A Calcium oxide is a covalent compound and potassium bromide is an ionic compound. B Calcium is less reactive than potassium. C The forces of attraction between calcium ions and oxide ions is stronger than that between potassium ions and bromide ions. D The melting point of potassium is lower than calcium. 11 If 2 g of hydrogen gas contains x molecules, how many molecules will 2 g of oxygen gas contain? A 𝑥 2 B 𝑥 16 C 𝑥 32 D x 12 Under certain conditions, 50 cm 3 of a gaseous compound, N xOy, decomposes completely to give 50 cm 3 of nitrogen gas and 25 cm 3 of oxygen gas. All gas volumes are measured at the same temperature and pressure. Which of the following about the values x and y is correct? A x = 1, y = 2 B x = 2, y = 1 C x = 2, y = 3 D x = 2, y = 4 13 Zinc oxide is produced by heating zinc carbonate. ZnCO3 → ZnO + CO2 What is the percentage yield of zinc oxide if 125 g of zinc carbonate on heating produces 75 g of zinc oxide? (Mr ZnCO3 = 125, Mr ZnO = 81) A 125 x 81 75 x 100 B 125 x 75 81 x 100 C 1 125 x 75 81 x 100 D 75 81 x 100

7 14 18 g of magnesium required x cm3 of 0.500 mol/d m3 dilute hydrochloric acid to react completely. What is the value of x? A 3000 B 1500 C 3 D 1.5 15 Which of the following does not show suitable reagents used for preparation of the named salts? salt reagents A B C D barium sulfate lithium nitrate magnesium chloride lead(II) chloride barium nitrate solution + sulfuric acid lithium hydroxide solution + nitric acid magnesium + hydrochloric acid lead(II) carbonate + hydrochloric acid 16 Salt PQ is to be prepared by reacting the carbonate of P with the acid HQ by titration. What are the solubilities of the carbonate, the acid and the salt in water? carbonate of P acid HQ salt PQ A B C D insoluble soluble soluble insoluble soluble soluble insoluble soluble insoluble soluble insoluble soluble 17 When a solution of zinc sulfate was added to a solution containing the nitrates of barium, iron and copper, a white precipitate forms. What is the precipitate? A zinc nitrate B iron(II) sulfate C copper(II) sulfate D barium sulfate

8 18 An excess of sodium hydroxide is added to an aqueous solution of salt X and boiled. No observable change seen. However, ammonia gas is only given off after aluminium foil is added to the hot solution. What could X be? A ammonium chloride B sodium chloride C ammonium sulfate D sodium nitrate 19 Graphs X and Y shown below represent the results of two experiments (X and Y) , demonstrating the catalytic decomposition of hydrogen peroxide using manganese(IV) oxide. Assuming that all other conditions are kept con