NYJC H2 Chem Prelim P1 QP

[Turn Over NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 25 SEP 2017 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, CT and NRIC / FIN on the Answer Sheet in the spaces provided. There are thirty questions in 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 21 printed pages. KiasuExamPaper.com

2 NYJC 2017 H2 Chemistry 9729/01 PRELIM 1 To determine the mass of arsenic present in a sample of pesticide, all the arsenic was first converted to arsenate ion, AsO 4 3

. 1.25 x 10

3 mol of AgNO 3 was then added to precipitate AsO 4 3

as Ag 3 AsO 4 . The excess Ag + ions needed 3.64 cm 3 o f 0.054 mol dm

3 KSCN to form silver thiocynate, AgSCN. Calculate the mass of arsenic ( A r = 74.9) present in the sample of pesticide. A 0.015 g B 0.026 g C 0.079 g D 0.488 g 2 How many moles of electrons must be removed from each mole of methylbenzene, C 6 H 5 CH 3 , when it is oxidised to benzoic acid, C 6 H 5 COOH? A 1 B 2 C 4 D 6 3 Which elements have the same number of unpaired electrons in its orbitals with principal quantum number 2? 1 Beryllium 2 Carbon 3 Nitrogen 4 Oxygen A 1 and 2 only B 2 and 3 only C 2 and 4 only D 3 and 4 only KiasuExamPaper.com

3 NYJC 2017 H2 Chemistry 9729/01 PRELIM [Turn Over 4 The diagram below shows liquid trichloromethane and liquid benzene in burettes 1 and 2 respectively. What would happen to the flow of the liquids trichloromethane and benzene when a negatively-charged rod is brought near to each of them? Liquid trichloromethane Liquid benzene A Deflected towards the rod Deflected towards the rod B Undeflected Deflected towards the rod C Deflected towards the rod Undeflected D Undeflected Undeflected Burette 1 Liquid trichloromethane Burette 2 Liquid benzene KiasuExamPaper.com

4 NYJC 2017 H2 Chemistry 9729/01 PRELIM 5 Palladium compounds are widely used as catalyst in coupling reactions. One such compound is (dppf)PdC l 2 with its structure shown below. P P Fe R R R R Pd C l C l What does the structure of (dppf)PdC l 2 suggest about the nature of the bonding between Pd and the phosphorus atoms, and the oxida