1782f_06 RJC Promos - Raffles Junior College 2006 JC 1...

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Raffles Junior College 2006 JC 1 Promotion Examination H2 CHEMISTRY 28 September 2006 0815 – 1115 h 3 hours Additional Materials: Multiple Choice Answer Sheet Writing Paper READ THESE INSTRUCTIONS FIRST. DO NOT open this booklet until you are told to do so. Write your name and civics tutorial group on the multiple choice answer sheet provided as well as on the cover pages printed on pages 9 and 20 . Attempt all the questions in Sections A and B . Attempt 2 out of 3 questions in Section C . At the end of the paper, secure the cover page on page 9 on top of your answers to section B and the cover page on page 20 on top of your answers to section C . Submit answers to sections A , B and C separately. INFORMATION FOR CANDIDATES This paper consists of three sections: Sections A , B and 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 to spend not more than 40 minutes on this section. Section B consists of 3 structured questions. Answers to this section are to be written in the spaces provided on the question paper. Section C consists of 3 free-response questions. You are to attempt 2 out of the 3 questions . Answers to this section are to be written on writing paper. Begin each question on a fresh sheet. Answers written in pencil for sections B and C are subjected to penalty. You are reminded of the need for good English and clear presentation in your answers. ______________________________________________________________ This question booklet consists of 20 printed pages
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3 Section A (20 marks) For each question, there are four possible answers, A , B , C , and D . Choose the one you consider to be correct. Indicate your answers on the multiple choice answer sheet provided. 1 On heating, 0.02 mole of element M reacts with 600 cm 3 of oxygen gas at room temperature and pressure. What is the empirical formula of the oxide of M ? (Molar volume of a gas at r.t.p. = 24 dm 3 mol –1 ) A M 2 O B M 2 O 5 C M 4 O 5 D MO 5 2 25.0 cm 3 of a solution of hydrogen peroxide, H 2 O 2 , was oxidised by excess potassium manganate(VII) solution under acidic condition. Effervescence of oxygen gas was observed. The volume of oxygen gas produced at room temperature and pressure was 26 cm 3 . What is the concentration of hydrogen peroxide in the solution? (Molar volume of a gas at r.t.p. = 24 dm 3 mol –1 ) A 2.89 x 10 –2 mol dm 3 C 8.66 x 10 –2 mol dm 3 B 4.33 x 10 –2 mol dm 3 D 1.30 x 10 –1 mol dm 3 3 The electronic configurations of four elements are given below. Which of these elements has the highest first ionisation energy? A
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1782f_06 RJC Promos - Raffles Junior College 2006 JC 1...

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