2019 RVHS Prelim P1 ANS

River Valley High School 9729/01/PRELIM/19 [Turn over 2019 Prelim Examinations RIVER VALLEY HIGH SCHOOL JC2 PRELIM EXAMINATION CANDIDATE NAME CLASS 18J CENTRE NUMBER S 3 0 4 4 INDEX NUMBER H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 26 Sep 2019 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number on the Optical 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 Optical 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 16 printed pages

2 River Valley High School 9729/01/PRELIM/19 2019 Prelim Examinations For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 A 50.00 cm 3 of a solution of 0.300 mol dm 3 MoOx2 was reduced to Mo 3+ using Zn powder. The filtrate required 45.00 cm 3 of 0.200 mol dm 3 acidified KMnO4 to revert back to its original form of MoOx2. What is the value of x? A 1 B 2 C 3 D 4 2 10 cm 3 of an unknown hydrocarbon was combusted in excess oxygen gas. The gaseous mixture contracted by 30 cm3. The gaseous mixture further contracted by 40 cm3 when it was passed through aqueous sodium hydroxide. All volumes of gases were measured at room temperature and pressure. 1 cyclopropane 2 butane 3 cyclobutane 4 but-2-ene What is the hydrocarbon? A 1 and 2 only B 2 and 3 only C 3 and 4 only D 2, 3 and 4

3 River Valley High School 9729/01/PRELIM/19 [Turn over 2019 Prelim Examinations 3 The successive ionisation energies, in kJ mol1, of elements X and Y are given below. X 575 1820 2740 11600 14800 18400 23400 Y 1320 3390 5320 7470 11000 13330 71330 1 The element preceding X in the Periodic Table has a higher first ionisation energy. 2 Element Y has a lower first ionisation energy than the element preceding it in the Periodic Table. 3 X and Y forms a compound with the formula X3Y2. 4 Oxide of X dissolves in water to give an acidic solution. Which statements about X and Y are true? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 2 and 4 only

4 River Valley High School 9729/01/PRELIM/19 2019 Prelim Examinations 4 Use of Data Booklet is relevant to this question. Some isotopes are unstable and undergo beta decay (-decay). -decay is a process where a neutron transforms into a proton by the emission of an electron. The proton is retained in the nucleus. Which of the following change describes a -decay? A 40K  40Ca B 32P  31P C 11C  12C D 23Na  22Ne 5 Which graph does not describe the behaviour of a fixed mass of ideal gas at constant temperature? A B C D

5 River Valley High School 9729/01/PRELIM/19 [Turn over 2019 Prelim Examinations 6 Which of the following statements are correct? 1 Covalent compounds can act as electrolytes in water. 2 Ionic bonds and covalent bonds can occur in the same compound. 3 An ionic compound will have the greatest degree of covalent character if both the cation and anion are large. 4 Ionic compounds can conduct electricity in both solid and liquid states. A 1 and 2 only B 1 and 4 only C 3 and 4 only D 2 and 4 only 7 Which of the following shows a decrease in bond angle from left to right? A SiCl4 H2O NF3 B AlCl3 NH3 PH3 C PCl3 PF3 PBr3 D CCl4 SF6 XeF4

6 River Valley High School 9729/01/PRELIM/19 2019 Prelim Examinations 9 Which of the following statements are correct for a system at dynamic equilibrium? 1 The rate of both forward and backward reaction is the same 2 The concentration of reactants is equal to the concentration of products 3 The rate constant of forward reaction is equal to the rate constant of the backward reaction A 1 only B 1 and 2 only C 1 and 3 only D 2 and 3 only 8 The table below gives the standard enthalpy change of hydrogenation of three compounds to form cyclohexane: Compound ΔHhydrogenation /kJ mol1 benzene −206 1,3,5−cyclohexatriene −360 cyclohexene −120 Which of the following statements is correct? A 1,3,5−cyclohexatriene is more stable than benzene. B Benzene has a lower energy content than 1,3,5−cyclohexatriene. C The C=C bond energy in cyclohexene is weaker than that in 1,3,5−cyclohexatriene. D The enthalpy change of atomisation of benzene is smaller than that of 1,3,5−cyclohexatriene. 10 A pure sample of SO 3(l) is introduced into an evacuated vessel . The vessel, of constant volume, is heated to a constant temperature such that the equilibrium below is established. 2SO2(g) + O2(g) ⇌ 2SO3(g) The value of pressure is found to be 27% greater than if only SO3(g) were present. What is the mole fraction of oxygen in the equilibrium mixture? A 0.119 B 0.213 C 0.425 D 0.787

7 River Valley High School 9729/01/PRELIM/19 [Turn over 2019 Prelim Examinations 12 Caesium-137 is a radioactive isotope with a half -life of 30.2 years. Following the Fukushima Daiichi nuclear disaster in 2011, it was reported that about 8.4 kg of Caesium-137 was released into the sea. What is the mass of Caesium-137 left in the sea after 100 years? A 0.801 kg B 0.846 kg C 1.05 kg D 6.73 kg 11 Equal volumes of 1.35 × 105 mol dm 3 Bi(NO3)3 and 2.00 × 105 mol dm3 NaOH were added to a conical flask. Equilibrium was achieved within a few minutes and the following observations were made. Given that solubility of Bi(OH) 3 is 2.87 × 107 mol dm3, which option contains the correct descriptions? Precipitation of Bi(OH)3 IP vs Ksp for the solution at equilibrium A Yes IP > Ksp B Yes IP = Ksp C No IP = Ksp D No IP < Ksp

8 River Valley High School 9729/01/PRELIM/19 2019 Prelim Examinations 13 For the reaction: A(g) + B(g)  C(g) + D(g), the following experimental data was obtained. Expt No. [A] /mol dm–3 [B] /mol dm–3 Initial rate of reaction /mol dm–3 s–1 1 0.20 0.20 3.00  10–4 2 0.60 0.20 9.00  10–4 3 0.80 0.40 4.80  10–3 Which of the following conclusions can be drawn for the reaction? 1 The unit for rate constant is mol–2 dm6 s–1. 2 The overall equation is the rate determining step. 3 The initial rate of reaction can be calculated from the initial rate of formation of C(g). A 1 only B 1 and 2 only C 1 and 3 only D 2 and 3 only 14 The following equilibrium are studied at a fixed temperature T °C. Equilibrium 1: H2PO4 + SO42  HSO4 + HPO42 Equilibrium 2: HSO4  SO42 + H+ Kc = K2 Equilibrium 3: H2PO4  HPO42 + H+ Kc = K3 Given that K2 > K3, which of the following statements is correct? A HPO42 is a stronger acid. B H2PO4 is the conjugate base of HPO42. C The position of Equilibrium 1 lies to the left. D The rate of forward reaction for all three equilibrium decreases at (T+100) °C.

9 River Valley High School 9729/01/PRELIM/19 [Turn over 2019 Prelim Examinations 15 The graph below shows the variation in the standard enthalpy change of vaporisation, ΔH(vaporisation), for eight consecutive elements in the Periodic Table, all with atomic n