RVHS 2023 JC2 H2 CM Prelim P1 QP

River Valley High School 9729/01/PRELIMS/23 2023 Preliminary Examination [Turn over RIVER VALLEY HIGH SCHOOL JC 2 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 2 2 J CENTRE NUMBER S INDEX NUMBER H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 25 September 2023 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class, centre number and index number on the Answer Sheet in the spaces 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 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages and 1 blank page.

2 River Valley High School 9729/01/PRELIMS/23 2023 Preliminary Examination

3 River Valley High School 9729/01/PRELIMS/23 2023 Preliminary Examination [Turn over 1 Why is the third ionisation energy of magnesium much higher than that of aluminium? A Aluminium has more protons than magnesium. B Magnesium has a complete octet, but aluminium does not. C The ionic radius of Al2+ ion is larger than that of Mg2+ ion. D The electron to be removed from magnesium is closer to the nucleus. 2 When a beam of protons is passed through an electric field, the angle of deflection towards the negatively-charged plate is 12.0 . Which particle will undergo a deflection of 8.0  in the opposite direction? A 12C3 B 10B2 C 6Li4 D 3He 4 Which compound does not have a co-ordinate bond? A CO B CS2 C NO3  D NH4 + 3 Tritium, 3 1 H, is a radioactive isotope of hydrogen. It slowly turns into a helium isotope 3 2 He. Which statements about the two isotopes are incorrect? 1 Both isotopes have more neutrons than electrons. 2 Both isotopes have the same number of protons in their nuclei. 3 Both isotopes have the same number of charged sub-atomic particles. A 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

4 River Valley High School 9729/01/PRELIMS/23 2023 Preliminary Examination 5 Ice is the crystalline form of water. The diagram below shows part of the structure of ice. Which of the following statement is incorrect? A Ice is not a conductor of electricity. B Ice has a giant covalent structure. C The bond angle about oxygen in ice is 109.5 . D It has a lower density than water at 0 C due to its open structure. 6 A gas at a pressure of 4.5 0 atm is heated from 25 .0 C to 480 C and simultaneously compressed to one-third of its original volume. What is the final pressure of the gas? A 3.79 atm B 34.1 atm C 86.4 atm D 259 atm - - - - - - Hydrogen bond ───── Covalent bond

5 River Valley High School 9729/01/PRELIMS/23 2023 Preliminary Examination [Turn over 7 The table below shows the values of the ionic product of water, Kw, at two different temperatures. Temperature / C Kw / mol2 dm6 25 62 1.00  1014 1.00  1013 Which of the following statements is correct for pure water? A At 62 °C, pH = 14 − pOH. B At 62 °C, pH > 7. C At 62 °C, pOH < 7. D At 62 °C, pH < pOH. 8 Some Hf  values are given below. compound Hf / kJ mol1 SO2 297 SO3 396 The contact process involves the oxidation of sulfur dioxide using vanadium(V) oxide catalyst. The overall equation can be represented by the following equation. SO2(g) + 1 2 O2(g)  SO3(g) Which row correctly describes the sign of H and S for this reaction? H S A   B  + C +  D + +

6 River Valley High School 9729/01/PRELIMS/23 2023 Preliminary Examination 9 The enthalpy change of solution of ammonium chloride in +14.8 kJ mol 1 under standard conditions. Which of the following statement is true? A The energy level of products is lower than that of reactants. B The lattice energy of ammonium chloride is numerically larger than the sum of hydration energies of ammonium and chloride ions. C When 1 mole of ammonium chloride dissolves, 14.8 kJ of heat is released. D When 1 mole of ammonia dissolves in hydrochloric acid, 14.8 kJ of heat is taken in from the surrounding. 10 When steam condenses, 44.0 kJ mol1 of heat is evolved. Which statements about the condensation of 12.0 g of steam at 100 C are correct? 1 The enthalpy change of reaction is  29.3 kJ mol1. 2 The Gibbs free energy change is negative. 3 The entropy change is 78.6 J K1. A 1 and 3 only B 2 and 3 only C 2 only D 1, 2 and 3 11 A sample of gaseous methanal was contaminated with methane gas in the laboratory. 10 cm 3 of the sample of the gaseous mixture was combusted in the presence of 20 cm 3 excess pure oxygen. The final total volume decreases to 18 cm 3 at room conditions. What is the molar ratio of methanal : methane? A 2:1 B 4:1 C 8:1 D 10:9

7 River Valley High School 9729/01/PRELIMS/23 2023 Preliminary Examination [Turn over 12 Use of Data Booklet is relevant to this question. Solution containing 0.5 % by mass of sodium hypochlorite, NaC lO can be used as a disinfectant effective against a wide range of bacteria. Sodium hypochlorite reacts with acid to generate toxic chlorine gas according to the following equation. NaClO + 2HCl  Cl2 + H2O + NaCl What is the volume of 0.5 % sodium hypochlorite solution required to produce 90 cm3 of chlorine gas upon reacting with excess acid at room conditions? You may assume the density of solution is 1.0 g cm3. A 0.0101 cm3 B 0.559 cm3 C 55.9 cm3 D 111.8 cm3 13 The equation for the oxidation of nitrogen monoxide is shown below. NO + O2  2NO2 From the initial rates experiments, the following rate equations were derived. rate = k [O2] [NO2]2 The results of the initial rates experiments are shown below. Initial [O2] / mol dm3 Initial [NO2] / mol dm3 Initial rate / mol dm3 min1 0.1 0.1 0.1 0.2 0.2 x 0.3 0.4 y 0.4 z 6.4 What are the values of x, y and z? x y z A 0.4 1.2 1.6 B 0.8 3.6 0.4 C 0.8 4.8 0.16 D 0.8 4.8 0.4

8 River Valley High School 9729/01/PRELIMS/23 2023 Preliminary Examination 14 The decomposition of dinitrogen pentoxide is a first order reaction with a rate constant of 5.00  104 s1 at 45.0 C. How long would it take for a sample of dinitrogen pentoxide to decompose 60% of its initial amount at 45.0 C? A 17.0 min B 30.5 min C 1020 min D 1830 min 15 The graph below shows how the percentage of product present at equilibrium varies with temperature and pressure for a reaction. Which reaction could the graph represent? A 4Fe (s) + 3O2 (g)  2Fe2O3 (s) H = −1644 kJ mol−1 B 2C (s) + O2 (g)  2CO (g) H = −222 kJ mol−1 C N2O4(g)  2NO2(g) H = +57 kJ mol−1 D CO(g) + Cl2(g)  COCl2(s) H = +86 kJ mol−1 16 The solubility of Mn(OH)2 in water at 25 °C is 3.60  10–5 mol dm–3. What is the solubility of Mn(OH) 2 in mol dm –3 in a buffer solution of pH 12.0 at the same temperature? A 1.87  10–9 B 1.87  10–1 C 4.67  10–2 D 4.67  10–10 Pressure Percentage of product (T + 20) °C T °C

9 River Valley High School 9729/01/PRELIMS/23 2023 Preliminary Examination [Turn over 17 The numerical values of the solubility product of calcium carbonate and calcium fluoride at 25.0 °C are 8.7  10−9 and 4.0  10−11 respectively. Which of the following statements is correct? 1 Calcium carbonate has a lower solubility than