RI_H2_CHEM_P1 Prelim

© Raffles Institution 2016 9647/01/S/16 [Turn Over 1 RAFFLES INSTITUTION 2016 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 26 September 2016 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 correction fluid. Write your name, class and index number in the spaces provided on the Answer Sheet. There are forty 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 the question booklet. This document consists of 18 printed pages.

© Raffles Institution 2016 9647/01/S/16 [Turn Over 2 Section A For each question, there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Which of the following statements best explains why helium has the highest first ionisation energy among all the elements in the Periodic Table? A It is unreactive. B It is the least electronegative element. C It has only one completely filled principal quantum shell. D Its valence electron is poorly shielded and is very close to the nucleus. 2 When a beam of protons travelling at the same speed passes through an electric field of constant strength, the protons, 1H+, are deflected through an angle of +12o. Under identical conditions, which particle would be deflected through an angle of +8o? A 2H+ B 3He2+ C 6Li2+ D 12C3+ 3 Use of the Data Booklet is relevant to this question. Which particle has three unpaired electrons? A V3+ B F2+ C Ni D S– 4 FeSO4 reacts with K2Cr2O7 in acid solution according to the following equation. 14H+ + 6Fe2+ + Cr2O72–  2Cr3+ + 6Fe3+ + 7H2O A 20.0 cm 3 sample of FeSO 4 solution required 13.1 0 cm3 of 0.100 mol dm –3 acidified K2Cr2O7 for complete reaction. What was the concentration of the FeSO4 solution? A 0.0655 B 0.153 C 0.393 D 0.916

© Raffles Institution 2016 9647/01/S/16 [Turn Over 3 5 1,3,5-triazine is an aromatic compound and its structure resembles that of benzene. 1,3,5-triazine Which statement about 1,3,5-triazine is correct? A Its empirical formula is CN. B A molecule of 1,3,5-triazine has six  bonds. C The C–N bond is formed by 2sp2–2sp2 overlap. D All the carbon-nitrogen bonds have equal bond lengths. 6 Which of the following shows the correct shape and bond angle of the molecule given? molecule shape bond angle A OF2 bent 117o B BH3 trigonal pyramidal