1779f_04 RJC Promos - RAFFLES JUNIOR COLLEGE 2004 PROMOTION...

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- 1 - INSTRUCTIONS TO CANDIDATES 1. Do not open this booklet until you are told to do so. 2. Answer all questions. This paper consists of three sections: Section A , Section B and Section C . Section A consists of 20 multiple-choice questions. For each question, choose the answer you consider to be correct and record your choice with a 2B pencil on the separate answer sheet provided. You are advised not to spend more than 30 minutes on this section. Section B consists of 4 structured questions. Answers to this section are to be written in the spaces provided on the question paper. Section C consists of 4 free response questions. Answers to this section are to be written on writing paper. Start each question on a fresh page. 3. Write your answers in ink. Writing in pencil will be subjected to penalty. 4. At the end of the examination, attach the cover page (page 8) on top of your answers to Sections B and C. INFORMATION FOR STUDENTS The Periodic Table is provided on page 2. The number of marks is given in brackets [ ] at the end of each question or part of a question. You are reminded of the need for good English and clear presentation in your answers. This question paper consists of 17 printed pages. RAFFLES JUNIOR COLLEGE 2004 PROMOTION EXAMINATION CHEMISTRY Level: JCI 12 October 2004 Time: 2 hr 30 min
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- 3 - SECTION A: MULTIPLE-CHOICE QUESTIONS (20 marks) For questions 1 to 15, four possible answers labelled A , B , C and D , are given for each question. Choose the one which you consider the most appropriate and record your choice with a 2B pencil on the separate answer sheet provided. 1 . In a recent practical examination, students are asked to determine the percentage of iron in a piece of iron of mass 2.500 g using a redox titration. A student placed the piece of wire into a conical flask containing sulphuric acid and warmed the resulting mixture. When all the iron had reacted and converted to Fe 2+ , the solution was cooled to room temperature and made up to 250 cm 3 in a volumetric flask. 25.0 cm 3 of this solution was then acidified and titrated against a 0.0185 mol dm -3 solution of potassium dichromate(VI). The volume required was 35.0 cm 3 . What is the percentage of iron in the iron wire? A 43.4 % B 72.3% C 86.7% D 97.5 % 2 . Which of the following does not always correctly represent the behaviour of an ideal gas? ( ρ = density of gas, P= pressure of gas, V m = molar gas volume, c = concentration, T = temperature) A P T B P V m T C P cT D P T 3 . In a mass spectrum of CH 3 CH 2 CH=O, which of the following peaks has the lowest relative peak height? A m/e = 1 B m/e = 15 C m/e = 16 D m/e = 29 4 . In which of the following pairs does the first specie have a higher ionisation energy than the second? A
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1779f_04 RJC Promos - RAFFLES JUNIOR COLLEGE 2004 PROMOTION...

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