RI 2022 Y6 CT QP

1 This document consists of 41 printed pages. RAFFLES INSTITUTION 2022 YEAR 6 TERM 3 COMMON TEST Higher 2 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 9729 28 June 2022 2 hours 45 minutes Additional Materials: Multiple Choice Answer (OMR) Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, 6-digit exam index number and civics tutorial group in the spaces provided on the OMR sheet and the cover sheets on pages 1 and 25. Shade your 6-digit exam index number on the OMR sheet. This paper consists of three sections, A, B and C. Section A (15 marks) consists of 15 multiple-choice questions. Answer this section first. The OMR sheet will be collected after the first 30 minutes. 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 OMR sheet. 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 paper. Section B (40 marks) consists of 3 structured questions. Answer all questions in the spaces provided in the question paper. If additional space is required, you should use the pages at the end of the booklet for Section B (pages 23 – 24). The question number must be clearly shown. Section C (40 marks) consists of 4 free-response questions. Answer both C1 and C2, and only one of C3 EITHER or C3 OR. Answers to this section are to be written in the spaces provided in the question paper. If additional space is required, you should use the pages at the end of the booklet for Section C (pages 40 – 41). The question number must be clearly shown. Write in dark blue or black pen. You may use a n HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. Question Marks B1 / 10 B2 / 15 B3 / 15

2 © Raffles Institution 2022 9729/J/22 [Turn Over Section A (15 marks) For each question, there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Iodate(V) ions react with iodide ions under acidic conditions. IO3– + 5I– + 6H+ → 3I2 + 3H2O 25.0 cm3 of 0.100 mol dm −3 solution of iodate( V) ions was added to a solution containing excess iodide ions and sulfuric acid . The liberated iodine was then titrated with sodium thiosulfate solution.