2023 MSHS Chem Prelims 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 30 August 2023 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 16. 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 16 printed pages.

2 1 Gases produced in chemical reactions can be collected for future usage. An experiment was conducted where reactants were placed into a conical flask and the gas produced was collected using displacement of water method as shown below. Which of the following reactions is this method not suitable? A decomposition of aqueous hydrogen peroxide B decomposition of calcium carbonate C reacting magnesium metal with dilute sulfuric acid D reacting ammonium chloride and dilute potassium hydroxide 2 Which of the following pairs of substances can be separated by heating? A ammonium chloride and sodium chloride B ammonium chloride and solid iodine C magnesium oxide and silver carbonate D magnesium oxide and copper

3 3 The diagram below shows a burning candle. Which of the following shows the correct description of the movement of the particles in (1), (2) and (3)? (1) (2) (3) A particles move randomly in any direction particles vibrate in fixed positions particles can rotate and slide over one another B particles move randomly in any direction particles can rotate and slide over one another particles vibrate in fixed positions C particles can rotate and slide over one another particles move randomly in any direction particles vibrate in fixed positions D particles vibrate in fixed positions particles can rotate and slide over one another particles move randomly in any direction 4 Chromatography was used to separate a mixture containing two dyes. The Rf values of two dyes are given in the following table. dye X Y Rf 0.60 0.40 If dye X moves a distance of 9 cm from the starting line, what is the distance between dyes X and Y on the same chromatogram? A 1 cm B 2 cm C 3 cm D 4 cm (1) (2) (3)

4 5 The solubility of four solids, P, Q, R and S are as shown in the table below. P Q R S solubility in water soluble insoluble insoluble soluble Kevin tried to separate mixtures of these solids using the following steps. 1) Add the mixture to a beaker of water and stir. 2) Filter the mixture. 3) Obtain one of the solids from the mixture using crystallisation. Which of the following mixtures could not be separated by this method? A P and R B Q and P C Q and R D R and S 6 An ion X3- has a mass number of m and n electrons. What does the nucleus of an atom of X contain? number of protons number of neutrons A n - 3 n - m B n - 3 m – (n - 3) C n + 3 m – (n + 3) D n + 3 m + n 7 A sample of silver metal consists of 2 stable isotopes, 51.8% of silver-107 and 48.2% of silver-109. What is the average relative atomic mass of the metal? A 106 B 107 C 108 D 109

5 8 Which of the following consists of compounds only? A silver nitrate, copper(II) sulfate solution, magnesium oxide B carbon monoxide, propane, carbon dioxide C bronze, steel, pewter D graphite, calcium, limestone 9 When a saturated aqueous solution of ammonium cobalt(II) sulfate hexahydrate, (NH4)2Co(SO4)2.6H2O is cooled from 60 °C to room temperature, crystals are formed. Which statement about this process is correct? A The mass of the solvent in the solution increases. B The concentration of the solution remains the same. C The mass of the solute dissolved in the solution decreases. D The solubility of the solute increases as the temperature falls. 10 Which of the following consists of substance containing both ionic and covalent bonds? A aluminium sulfate B beryllium chloride C sulfur dioxide gas D chromium oxide 11 Capsaicin, which is found in chilli and pepper, causes the spicy burning sensation in the mouth. It has the molecular formula C18H27NO3 and has a melting point of 65 ᵒC. Which of the following statements best explains why drinking water is ineffective in removing the burning sensation caused by capsaicin? A Capsaicin has a giant molecular structure and is soluble in water. B Capsaicin has a giant molecular structure and is not very soluble in water. C Capsaicin has a simple molecular structure and is soluble in water. D Capsaicin has a simple molecular structure and is not very soluble in water.

6 12 In an experiment, 1 mol of powdered copper and 1 mol of powdered zinc are placed in a flask. 3 mol of hydrochloric acid is then added to the flask. The flask is left until all the reactions, if any, are completed. Which diagram shows the results of the experiment? 13 49.2 g of hydrated magnesium sulfate is heated and cooled repeatedly until it reaches a constant mass of 24.0 g. Assuming only water of crystallisation is lost when hydrated magnesium sulfate is heated, what is the formula of the hydrated magnesium sulfate? (Ar of Mg=24, S=32, O=16, H=1) A MgSO4.H2O B MgSO4.3H2O C MgSO4.5H2O D MgSO4.7H2O

7 14 The formula of an oxide of element X is X3O. 5.9 g of X3O contains 4.3 g of X. How many moles of X ions does 5.9 g of X3O contain? A 1.616 ÷3 B 1.616 ×3 C 5.916×3 D 5.916×3 15 A student wishes to dilute a solution of sodium hydroxide. Calculate the volume of deionised water that she needs to add to 20.0 cm3 of 2.00 mol/dm3 sodium hydroxide so that the concentration of the resulting solution is 0.300 mol/dm3. A 0.200 dm3 B 0.245 dm3 C 0.113 dm3 D 0.040 dm3 16 A piece of iron metal does not react when it was placed into a solution of hydrogen chloride dissolved in methylbenzene, an organic solvent. Which modification will allow the iron to react? A add water and stir B increase the surface area of iron metal C bubble more hydrogen chloride gas into the mixture D sand paper the piece of iron metal 17 Which of the following is/are suitable methods to test the strength of both nitric acid and ethanoic acid of the same concentration? I using a pH meter II measuring their electrical conductivity III titration using potassium hydroxide solution A I and II B III only C I and III D I, II and III

8 18 Y is a black solid with formula Ga2O3. A reaction took place as followed. Ga2O3 + 2KOH à 2KGaO2 + H2O What is the role of Y in the reaction? It is acting as a/an _______________. A acidic oxide B basic oxide C neutral oxide D amphoteric oxide 19 Which of the following can be used to distinguish between a solution of aluminium nitrate and lead(II) nitrate? A bromine solution B aqueous sodium hydroxide C dilute sulfuric acid D aqueous hydrogen peroxide 20 Which of the following can be used to test for chlorine gas? A litmus paper B cobalt(II) chloride paper C locating agent D concentrated sulfuric acid 21 Which of the following represents the overall reaction in th