2022 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 2022 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 A gas X is insoluble in water and less dense than air. An impure supply of moist gas X contains a water-soluble impurity. In which order should the pieces of apparatus shown be joined together after Step 1 to collect a pure, dry sample of X? A 2,3,4 B 2,3,5 C 3,2,5 D 3,2,4 2 The diagram shows a chromatogram obtained when a single dye is analysed. Three measurements, x, y and z are shown. How is the Rf value of the dye calculated? A x x + y B y 𝑥 + 𝑦 C x 𝑥 + 𝑦 + 𝑧 D 𝑦 𝑥 + 𝑦 + 𝑧 3 Solid samples of ammonium chloride, lead(II) chloride and sodium chloride were accidentally mixed together. Which of the following sequences outlines the best method to obtain the pure dry sample for each substance? A dissolving, filtration, sublimation, crystallisation B dissolving, fractional distillation, filtration, evaporation C sublimation, dissolving, filtration, evaporation D sublimation, filtration, evaporation, crystallisation ���

3 4 When heated steadily, an impure solid R melted over a range of 121 oC to 126 oC. Which of the following could be the melting point of R? A 120 oC B 121 oC C 125 oC D 128 oC 5 The apparatus below is used to show the diffusion of gases. Which pair of gases X and Y would cause no movement of the water? X Y A CO NO2 B CO2 C2H6 C N2 C2H4 D C2H4 C2H6 6 Benzene, C6H6, melts at 5.5 oC and boils at 80.1 oC. Which statement best describes the changes in benzene as benzene is heated from room temperature to 90 oC? A Benzene molecules lose energy and eventually, they move about freely. B Benzene molecules gain energy and eventually, they vibrate and slide past one another. C Benzene molecules lose energy and eventually, they vibrate about their fixed positions. D Benzene molecules gain energy and eventually, they move about freely. ���

4 7 A new substance was discovered and a series of experiments were conducted on it. Which observation suggests that the substance cannot be an element? A It had a fixed melting point. B Electrolysis of the molten substance gives two products. C It dissolved in water to give a colourless solution. D When heated in air, it could form two oxides. 8 Which diagram best shows the structure of an alloy? A B C D 9 Three atoms M, E and T have mass numbers of 235, 238 and 239 respectively. M has 92 protons; E has 92 neutrons and T has 147 neutrons. Which of these atoms are isotopes? A M, E and T B M and E C M and T D E and T 10 Two particles having the same number of protons and neutrons but different numbers of electrons could be A an atom and a molecule of the same element. B an atom and an ion of the same element. C ions of two different elements. D an atom and an ion of different elements. ���

5 11 The table below shows information for five elements. The symbols used here do not represent the actual chemical symbols of the elements. element P Q R S T mass number 16 24 27 39 88 number of neutrons 8 12 14 20 50 Which two elements are in the same Group of the Periodic Table? A P and R B P and S C Q and S D Q and T 12 When a sulfur atom becomes a sulfide ion, the following changes could take place: I the atomic number of sulfur increases by 2 II the atom gains 2 electrons III the mass number of sulfur increases by 2 IV the ion formed has a 2+ charge Which of the following options is correct? A I, II and IV only B I and II only C II and IV only D II only 13 The table below gives the number of protons, neutrons and electrons in particles I, J, K, L and M. The symbols used here do not represent the actual chemical symbols of the elements. particle protons neutrons electrons I 8 8 10 J 17 18 17 K 12 12 12 L 11 12 10 M 7 7 7 Which of the particles will form an ionic compound with I and what is the corresponding formula of the compound formed. particle formula of compound A J J2I B K KI C L L2I D M MI2 ���

6 14 The table below shows the electrical conductivity of four substances: substance electrical conductivity W does not conduct under any condition X conducts when dissolved in water Y conducts when molten Z conducts when solid and when molten Which of the following correctly identifies W, X, Y and Z? W X Y Z A CH3OH NH3 Al2O3 Au B NH3 Al2O3 CH3OH Au C NH3 CH3OH Al2O3 Au D Al2O3 NH3 Au CH3OH 15 Excess aqueous lead(II) nitrate is added to aqueous potassium iodide. The precipitate formed is removed by filtration. What ions are present in the filtrate? A Pb2+ and I- B K+ , NO3 - , H+ and OH- C K+ , Pb2+ , NO3 - , H+ and OH- D K+ , Pb2+ , I- , NO3 - , H+ and OH- 16 The melting point of aluminium oxide is much higher than melting point of calcium oxide. Which statement explains this? A A calcium ion has a smaller charge than an aluminium ion. B A calcium ion has more protons than an aluminium ion. C A calcium ion has more shells of electrons than an aluminium ion. D Calcium is more reactive than aluminium. 17 The formula of thalium sulfate is Tl2SO4 and that of ammonium vanadate is NH4VO3. Which of the following represents the formula of thalium vanadate? A Tl2VO3 B TlVO4 C Tl(VO3)2 D TlVO3 ���

7 18 Monosodium glutamate, commonly called MSG, is a popular seasoning and flavour enhancer. If the relative molecular mass of MSG is 169, and the formula of MSG is known to be C5H8XO4Na, what is the element X in the compound? A Chlorine B Nitrogen C Silicon D Sulfur 19 A compound contains 0.291 g of carbon, 0.0484 g of hydrogen, 0.230 g of fluorine and 0.430 g of chlorine. The empirical formula of this compound is A CHFCl B C2H2FCl C C2H4FCl D CH4FCl 20 8 g of a sample of X2O3 contains 0.1 mole of element X. What is the mass of X in the sample? A 1.6 g B 2.4 g C 5.6 g D 11.2 g 21 Molecules of hydrogen(H 2) and chlorine(Cl 2) are produce