VJC Prelim P1_QP and Ans

© VJC 2018 9729/01/PRELIM/18 [Turn over VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 19 September 2018 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 Exam Number, name and CT group on the Multiple Choice Answer Sheet. There are thirty questions. 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 choices in soft pencil on the separate Multiple Choice Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. No mark will 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 8 printed pages.

2 © VJC 2018 9729/01/PRELIM/18 1 The Avogadro constant is L. How many neutrons are present in 24 dm 3 of chlorine gas, measured at r.t.p? A 17 L B 18.5 L C 37 L D 71 L 2 A carbon sample contains a mixture of 12C and 14C isotopes. When 1.000 g of this sample is burned completely in 16O2. The mass of CO2 formed is 3.629 g. What is the percentage by mass of the 12C isotope in this sample? A 85.0% B 88.6% C 90.0% D 91.4% 3 When phosphoryl chloride, POC l 3, dissolves in water, it gives a mixture of phosphoric acid and hydrochloric acid. How many moles of sodium hydroxide would be needed to neutralise the solution formed by adding one mole of POCl3 to excess water? A 3 B 4 C 5 D 6 4 Which of the following pairs have similar shapes and the first species has a smaller bond angle than the second species? 1 SiCl 4, PF4+ 2 PH3, NH3 3 SO32–, CO32– A 1 only B 2 only C 1 and 2 only D 2 and 3 only 5 But-2-enedioic acid, HC(CO2H)=C(CO2H)H, exists as a pair of cis-trans isomers. The cis isomer has a lower melting point than the trans isomer. Which of the following statements is correct about but-2-enedioic acid? 1 In the solid state, both the cis and trans isomers have the same density. 2 Intramolecular hydrogen bonding is present in the cis isomer. 3 The cis isomer is less polar than the trans isomer. A 2 only B 1 and 2 only C 1 and 3 only D 2 and 3 only 6 Which of the following statements about prop-1,2-diene, H 2C=C=CH2, is not correct? A The C=C in prop-1,2-diene is stronger than the C=C in ethene. B The two π-bonds in prop-1,2-diene are perpendicular to each other. C There are only two sp 2 hybridised carbon atoms in a prop-1,2-diene molecule. D Prop-1,2-die