JC2 Prelim 2017 RI ALL QP+ans

© Raffles Institution 2017 9729/01/S/17 [Turn Over RAFFLES INSTITUTION 2017 YEAR 6 PRELIMINARY EXAMINATION HIGHER 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 25 September 2017 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not open this question booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correcti on fluid. Write your name, class and index number in the spaces provided on the Answer Sheet. 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 an d 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 ded ucted for a wrong answer. Any rough working should be done in this booklet. The use of an approved scientifi c calculator is expected, where appropriate. This document consists of 15 printed pages. KiasuExamPaper.com

2 © Raffles Institution 2017 9729/01/S/17 [Turn Over 1 A to H are consecutive elements with atom ic numbers less than 20. The g raph below shows their second ionisation energies (2 nd IE). Which of the following statements is correct? A The 2 nd IE of G is lower than that of F due to the inter-electronic repulsion between its paired s electrons. B C exists as diatomic molecules at room temperature. C The compound formed between A and E has a low melting point. D Element B is from Group 17. 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 ABCDEFGH 2 nd IE element KiasuExamPaper.com

3 © Raffles Institution 2017 9729/01/S/17 [Turn Over 2 The graph below shows the successive ionisation energies of the Period 4 element, X . Which of the following statements about X is correct? A X is Fe. B X belongs to Group 16. C X has 6 unpaired electrons in the ground state. D A stable compound, Na X O 4 , can be formed. 3 Which statement about ionic and covalent compounds is correct? A Some covalent compounds can serve as electrolytes in water. B Ionic compounds can conduct electricity in both the solid and l iquid states. C Ionic bonds and covalent bonds c annot both occur in the same co mpound. D An ionic compound will have greater covalent character if the radius of the cation is large. 0123456789 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 22 ionisation energy number of electrons removed KiasuExamPaper.com

4 © Raffles Institution 2017 9729/01/S/17 [Turn Over 4 2-Furonitrile has the following structure. Which row correctly describes th e bonding and hybridisation in the above molecule? number of S bonds number of sp C atoms number of sp 2 C atoms A 3 0 5 B 4 1 4 C 4 0 5 D 2 1 4 5 Ideal gases P and Q , initially at different pressures and temperatures, are placed in different bulbs as shown in the diagram below . The bulbs are connected by a narrow tube of negligible volume . When t ap T is opened, the gases mix. What is the final pressure of the mixture if both bulbs are then maintained at 127 q C? A 22.5 kPa B 36.7 kPa C 73.1 kPa D 104 kPa tap T gas Q 300 cm 3 20 kPa 27 °C t gas P 100 cm 3 10 kPa 127 °C KiasuExamPaper.com

5 © Raffles Institution 2017 9729/01/S/17 [Turn Over 6 Use of the Data Booklet is relevant to this question. Elements X , Y and Z are either chlorine, bromine or iodine. The following is a seri es of test s performed to determine the identities of the elements. When X 2 is added to separate solutions containing Y – and Z – ions, no reaction occurs. When Y 2 is added to a solution containing Z – ions, no reaction occurs. Which of the following statements are correct? 1 X is iodine. 2 The reaction between Z 2 (aq) and Y – (aq) will occur spontaneously. 3 When a limiting amount of KMnO 4 is added to X – (aq), and the mixture shaken with hexane, the organic layer turns violet. A 1, 2 and 3 only B 1 and 3 only C 2 only D 1 only 7 Which of the following statements about the Period 3 elements sodi um to chlorine, and their compounds , is correct? 1 The ionic radius decreases across the period. 2 The maximum oxidation state of the elements in their oxides increa ses across the period. 3 The boiling points of the elements decreases in the order phospho rus > sulfur > chlorine. A 2o n l y B 2 and 3 only C 1a n d 2o n l y D 1 and 3 only 8 The relative atomic mass of iridium, which consists of the isot opes 191 I r and 193 I r, is 192.2. What is the percentage of 193 I r atoms in the mixture? A 40 % B 45 % C 55 % D 60 % KiasuExamPaper.com

6 © Raffles Institution 2017 9729/01/S/17 [Turn Over 9 In 2016, several high profile tennis players were banned for co nsuming the performance -enhancing drug Meldonium. Meldonium What is the empirical formula of Meldonium? A C 3 HN 2 O 2 B C 3 H 7 NO C C 3 H 8 N 2 O 2 D C 6 H 14 N 2 O 2 10 When 30 cm 3 o f 1 . 0 m o l d m – 3 KOH(aq) is neutralised with an equal volume of 1.0 mol dm – 3 HC l (aq), the temperature of the mixture rose by 6.8 ο C. What would be the temperature change if 15 cm 3 of 2.0 mol dm – 3 KOH (aq) is reacted with an equal volume of 2.0 mol dm – 3 HC l (aq)? A 3.4 ο C B 6.8 ο C C 13.6 o C D 27.2 o C 11 When aqueous Ba(OH) 2 reacts with dilute sulfuric acid, the following reaction takes place. Ba(OH) 2 (aq) + H 2 SO 4 (aq) o BaSO 4 (s) + 2H 2 O(l) ' H { ' H { can be calculated using only three of the following enthalpy ch anges. Which one of the following is not used in the calculation of ' H { ? A lattice energy of BaSO 4 B standard enthalpy changes of hydration of Ba 2+ and SO 4 2 – C standard enthalpy change of neutralisation of HC l with NaOH D standard enthalpy change of solution of Ba(OH) 2 KiasuExamPaper.com

7 © Raffles Institution 2017 9729/01/S/17 [Turn Over 12 The age of rock samples can be calculated using Uranium-Lead da ting. 235 U is an unstable isotope which decays into 207 Pb. This nuclear reaction obeys first- order kin etics with a half-life of 710 million years. The decay can be summarised by the following equation: 235 U o 207 Pb + other decay products A rock sample had a 235 U : 207 Pb ratio = 1 : 7. Assuming that all the 207 Pb detected was formed from the decay of 235 U, what is the age of the rock sample ? A 710 million years B 1420 million years C 2130 million years D 2840 million years 13 The initial rate of the reaction between H 2 O 2 and acidified K I solution can be studied by the “clock” method, using a small but constant amount of Na 2 S 2 O 3 . The equations for the reactions are as follows. H 2 O 2 + 2 I − + 2H + → I 2 + 2H 2 O reaction 1 2S 2 O 3 2 − + I 2 → S 4 O 6 2 − + 2 I − reaction 2 Reaction 2 takes place at a much higher rate than reaction 1 . When the Na 2 S 2 O 3 is used up, the free I 2 produced will form a deep blue complex with starch. The rate equation for reaction 1 was found to be: rate = k[ I − ][H 2 O 2 ] Assuming no other reactions occur, which of the following statements are corre ct if a large excess of S 2 O 3 2 – were used instead? 1 The mixture will not turn blue-black. 2 The reaction becomes overall pseudo-first order. 3 As the reactions proceed, the [ I − ] will remain effectively constant. A 1 only B 2 and 3 only C 1 and 3 only D 1, 2 and 3 only KiasuExamPaper.com

8 © Raffles Institution 2017 9729/01/S/17 [Turn Over 14 0.40 dm 3 of gaseous (HCOOH) 2 was allowed to dissociate under constant pressure of 1 atm at 300 ο C in a gas syringe according to the equation below. (HCOOH) 2 (g) ֖ 2HCOOH(g) Wh e n e q u i l i b r i u m w a s a c h i e v e d , t h e t o t a l v o l u m e o f t h e m i x t u r e increased to 0.60 dm 3 . What is the K p for the reaction at 300 ο C? A 0.0170 atm B 1.33 atm C 800 atm D 135 000 atm 15 T