RJC_Chemistry H2 P1 with Ans Prelims

-1- RAFFLES JUNIOR COLLEGE PRELIMINARY EXAMINATION 2008 HIGHER 2 CHEMISTRY 9746/01 Paper 1 Multiple Choice 19 September 2008 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, Candidate Number on the Answer Sheet in the spaces provided. There are forty 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 to be correct and record your choice with a 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. This question booklet consists of 15 printed pages.

-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 An element Z has a second ionisation energy higher than that of the element preceding it and the element after it in the Periodic Table. What is the atomic number of Z? A 10 B 13 C 14 D 15 2 The use of the Data Booklet is relevant to this question. The pH of pure water is 7.0 at 298 K. Which of the following quantities is equal to the number of ions in 1 dm 3 of pure water at 298 K? A The number of atoms in 4.48 x 10 –6 dm 3 of C l2 at s.t.p. B The number of neutrons in 8.0 x 10 –7 g of deuterium gas, D 2 (D = 2H). C The number of molecules in 1.44 x 10 –4 g of Buckministerfullerene, C 60 . D The number of anions in 1.0 x10 –14 dm 3 of 1.0 mol dm –3 K 3[Fe(CN) 6](aq). 3 Self-igniting flares contain Mg 3P2. With water this produces diphosphane, P 2H 4, which is spontaneously flammable in air. Which equation that includes the formation of diphosphane is balanced? A Mg 3P2 + 6H 2O → 3Mg(OH) 2 + P 2H 4 B Mg 3P2 + 6H 2O → 3Mg(OH) 2 + P 2H 4 + H 2 C 2Mg 3P2 + 12H 2O → 6Mg(OH) 2 + P 2H 4 + 2PH 3 D 2Mg 3P2 + 12H 2O → 6Mg(OH) 2 + 3P 2H 4 4 Which of the following statements is correct? A XeF 4 and H 2C=C=CH 2 are planar molecules. B BC l3 and BrC l3 have the same molecular shape. C Benzene and cyclohexene are non–polar liquids. D LiA lH 4 and NaBF 4 contain dative covalent bonds. 5 Which of the following changes will have the greatest effect on the density of a fixed mass of an ideal gas? Pressure Temperature / K A doubles halves B doubles doubles C halves halves D halves constant

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