2019 MI Prelim H2 Chem P1 QP

Class Adm No Candidate Name: This question paper consists of 15 printed pages and 1 blank page. 2019 Preliminary Exams Pre-University 3 H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 24 Sept 2019 1 hour Additional materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not turn over this question paper until you are told to do so Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and admission number in the spaces provided at the top of this page and on the Multiple Choice Answer Sheet provided. There are thirty 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 Multiple Choice Answer Sheet provided. Read the instructions on the Multiple Choice 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 paper. The use of an approved scientific calculator is expected, where appropriate. FOR EXAMINER’S USE TOTAL (30 marks)

2 For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Which of the following contain one mole of the stated particles? 1 H+ ions in 1 dm3 of 0.5 mol dm-3 H2SO4(aq) 2 atoms in 6 dm3 of SO3(g) at room temperature and pressure 3 electrons in 64.1 g of SO2 4 neutrons in 1.6 g of 32S8 A 1 and 2 only B 2 only C 1 and 3 only D 1, 2, 3 and 4 2 Incomplete combustion of y dm3 of propanol gas yielded a mixture of carbon dioxide and carbon monoxide in the ratio of 2:1, together with water vapour. What is the volume of oxygen consumed? A 3.5y dm3 B 4y dm3 C 4.5y dm3 D 5y dm3 3 The redox reaction between potassium manganate(VII) and MnSO4 gives MnO2 as the only manganese-containing product. How many moles of MnSO4 react with one mole of potassium manganate(VII) in this reaction? A 0.5 B 1 C 1.5 D 2

3 [Turn over 4 The ion Z2+ has 12 electrons and 15 neutrons. Which of the following statements is true? A In an electric field, the ion Z2+ will be deflected at a smaller angle than that of Mg2+. B The first ionisation energy of element Z is lower than that of the Group 13 element in the same period as Z. C The chloride of Z formed is expected to have a higher melting point than MgCl2. D Element Z is isoelectronic with neon. 5 Consider the following four compounds. 1 CH3CH2CH2CH3 2 CH3CH2CH2OH 3 CH3CH2Cl 4 (CH3)3CH What is the order of increasing boiling point of the compounds? A 1 < 4 < 3 < 2 B 2 < 3 < 4 < 1 C 4 < 1 < 2 < 3 D 4 < 1 < 3 < 2

4 6 The research on metal complexes have achieved many international breakthrough developments, focusing on their properties and wide range of applications to tackle the challenges in human health and the environment. Which of the following types of bonding can be found in the complex? 1 ionic bonding 2 dative bonding 3 hydrogen bonding 4 ion-dipole interactions A 2 only B 1 and 2 only C 1 and 4 only D 2, 3 and 4 only

5 [Turn over 7 The conversion of graphite into diamond is endothermic and this reaction has an extremely small rate constant. Which reaction pathway correctly represents this conversion? A B C D graphite graphite graphite graphite diamond diamond diamond diamond

6 8 Reaction 1 Evaporation of ethanol Reaction 2 Atomisation of magnesium Reaction 3 Initiation step for the free radical substitution between chlorine and ethane Which of the following statements about the reactions are correct? 1 ∆H is positive for all reactions. 2 ∆S is positive for all reactions. 3 ∆G is positive for all reactions. A 1 only B 2 only C 1 and 2 only D 1,2 and 3 9 When the temperature of a closed vessel containing a gas is increased by 273 °C, the pressure was found to increase by 20%. What is the initial temperature of the closed vessel? A 1092 °C B 1092 K C 1365°C D 1365 K 10 Which of the following two species are acting as an acid and a conjugate acid respectively in the following reaction? H2O + ClO– ⇌ HOCl + OH– A H2O and HOCl B OH- and H2O C OH- and ClO– D HOCl and ClO–

7 [Turn over 11 The reaction for A + 2B → AB2 occurs by the following mechanism. Step 1 A + B ⇌ AB (fast) Step 2 AB + B → AB2 (slow) Which of the following represents the correct rate equation? A Rate = k[A] B Rate = k[B] C Rate = k[AB][B] D Rate = k[A][B]2 12 The following data was obtained during the first-order decomposition of the reaction: 2A(g) → B(g) + C(s) Time Total pressure 10 min 300 Pa After completion 200 Pa Given that the reaction took place in a sealed container at constant temperature, what is the half-life of the reaction? A 5 min B 10 min C 15 min D 20 min

8 13 Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine. They are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, as solvents, and as refrigerants. 2CHClF2 (g) ⇌ CF2=CF2 (g) + 2HCl (g) Species Standard enthalpy change of formation / kJ mol-1 CF2=CF2(g) –658.3 HCl(g) –92.3 CHClF2(g) –485.2 Based on the data provided, which of the following describes how would the concentration of CHClF2(g) at equilibrium varies with temperature? A B C D [CHClF2] temperature [CHClF2] temperature [CHClF2] temperature [CHClF2] temperature

9 [Turn over 14 Which of the following mixtures will form a solution that resist pH changes when small quantites of acid or base is added? A 500 cm3 of 1 mol dm-3 aqueous NaCl and 500 cm3 of 1 mol dm-3 aqueous HCl B 750 cm3 of 1 mol dm-3 aqueous CH3COOH and 250 cm3 of 1 mol dm-3 aqueous NaOH C 600 cm3 of 1 mol dm-3 aqueous NH3 and 400 cm3 of 1 mol dm-3 aqueous H2SO4 D 400 cm3 of 1 mol dm-3 aqueous NaOH and 600cm3 of 1 mol dm-3 aqueous H2SO4 15 What is the final pH of the solution formed by mixing equal volumes of two H2SO4 solutions, one of pH 2.0 and the other of pH 3.0? A 1.96 B 2.26 C 2.50 D 2.78 16 Q, R and S are three elements found in Period 3 of the Periodic Table. Among the elements in Period 3,  the melting point of the oxide of R is the highest.  the electrical conductivity of Q is the highest.  the melting point of S is the lowest. Which of the following elements is not represented by Q, R or S? A Na B Mg C Al D Ar 17 Fluorine has anomalous properties in Group 17. Which of the following statements is correct? A HF is a strong acid. B Fluorine is intensely coloured. C The melting point of fluorine is high. D The F–F bond is unusually weak.

10 18 Use of the Data Booklet is relevant to this question. Each galvanic cell is made up of two half-cells. E1, E2 and E3 are the cell potentials of the three galvanic cells respectively. Half-cell 1 Half-cell 2 Ecell 1 mol dm-3 Zn2+(aq) and Zn 0.1 mol dm-3 Cu2+(aq) and Cu(s) E1 1 mol dm-3 Zn2+(aq) and Zn 1 mol dm-3 Cu2+(aq)and Cu(s) E2 0.1 mol dm-3 Zn2+(aq) and Zn 1 mol dm-3 Cu2+(aq) and Cu(s) E3 Which of the following shows the correct sequence of Ecell arranged in decreasing order? A E2 > E3 > E1 B E3 > E2 > E1 C E1 > E2 > E3 D E1 > E3 > E2 19 Electrolysis of a dilute aqueous NaCl solution was carried out by passing 0.1 A current through it. What is the time required to liberate 0.01