2020 JPJC Prelim Paper 1

 Jurong Pioneer Junior College [Turn Over NAME CLASS 19S JURONG PIONEER JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION 2020 CHEMISTRY 9729/01 Higher 2 Paper 1 Multiple Choice 24 September 2020 1 hour Candidates answer on separate paper. 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 and exam index number on the Answer Sheet in the spaces provided unless this has been done for you. There are thirty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C or 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 12 printed pages.

2  Jurong Pioneer Junior College 9729/01/J2 PRELIMINARY EXAM/2020 1 When 20 cm 3 of a gaseous hydrocarbon was completely burnt in 130 cm 3 of oxygen, the volume of gas remaining a fter the reaction was 100 cm 3. This volume was decreased to 40 cm 3 when the resulting mixture was passed through aqueous NaOH. All measurements were made at room temperature and pressure. What is the formula of this hydrocarbon? A C2H2 B C3H6 C C3H8 D C4H10 2 25.0 cm3 of 0.05 mol dm 3 KClO4(aq) required 50.0 cm 3 of 0.20 mol dm 3 TiCl3 (aq) to reach the end-point. Given that titanium(III) is oxidised to titanium( IV) in this reaction, which of the following formulae correctly represents the reduction product of the ClO4 ion? A Cl B ClO2 C ClO3 D OCl 3 Alpha particles, 4 2 He2+, are commonly emitted by larger radioactive nuclei during radioactive decay. The diagram below shows the path of a mixture of a charged species X, 7 3 Li+ and alpha particles after passing through an electric field. Which of the following statements are true? 1 X could be an electron. 2 Plate Y is positive. 3 The angle of deflection of alpha particles is 3.5 times of the angle of deflection of Li+. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 Source

3  Jurong Pioneer Junior College 9729/01/J2 PRELIMINARY EXAM/2019 [Turn Over 4 Which element has the largest atomic radius? A Br B In C K D Rb 5 In which of the following pairs does the second compound have a higher boiling point than the first? A P4 Cl2 B CaO Na2O C CH3OH CH3ONa D CH3CH2OH CH3CH2SH 6 Which of the following pairs of species have the same shape? A PCl3 B