NJC Prelim P1_QP

NJC Preliminary Examination 9729/01/18 [Turn Over NATIONAL JUNIOR COLLEGE SH2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME SUBJECT CLASS REGISTRATION NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Optical Answer Sheet Data Booklet 9729/01 Thur 13 September 2018 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, subject class and registration number on the Answer Sheet in the spaces provided unless this has been done for you. There are 30 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 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 paper consists of 17 printed pages

2 NJC Preliminary Examination 9729/01/18 [Turn Over Instructions on how to fill in the Optical Mark Sheet Student Examples of Registration No. Shade: 1705648 75648 Example: Shade the index number in a 5 digit format on the optical mark sheet: 2nd digit and the last 4 digits of the Registration Number. SH1 CT CM G or IP B

3 NJC Preliminary Examination 9729/01/18 [Turn Over + – R S T For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Use of the Data Booklet is relevant to this question. The following are flight paths of charged particles when accelerated in an electric field. Which correctly identifies S, T and U? S T U A 15O+ 14C+ 14N+ B 15O⎯ 15O+ 28Si+ C 14N⎯ 28Si2+ 14C2+ D 14N⎯ 14C+ 28Si2+ 3 In which row are the molecules arranged in order of increasing bond angle? 1 CH 4, AlCl3, XeF2 2 H2S, PH3, NH3, 3 NF3 , NCl3, SO3 A 1, 2 and 3 B 1 and 2 C 2 and 3 D 1 only 2 In which sequence is the molecules listed in the order of increasing dipole moment? A SO3, CO2, AlCl3 B H2O, H2S, HBr C CF4, CO, HF D NH3, HF, BeCl2 S T U

4 NJC Preliminary Examination 9729/01/18 [Turn Over 4 Propadiene and propyne both have the same molecular formula, C 3H4. They exist in equilibrium as shown: H2C=C=CH2 CH 3C≡CH propadiene propyne Which bond is present in propadiene but not present in propyne? A a σ bond formed by s – sp overlap B a π bond formed by p – p overlap C a σ bond formed by sp – sp2 overlap D a σ bond formed by sp2 – sp2 overlap 5 Use of the Data Booklet is