RI 2021 Y5 Timed Practice QP

1 Name: ( ) Class: 22S0______ RAFFLES INSTITUTION 2021 YEAR 5 JULY COMMON TEST Higher 2 CHEMISTRY 9729 2 July 2021 2 hours 15 minutes Additional Materials: Multiple Choice Answer (OMR) Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, index number and civics tutorial group in the spaces provided on the OMR Sheet, and the cover sheets on pages 1 and 15. Do not use staples, paper clips, glue or correction fluid. This paper consists of three sections, A, B and C. Section A (15 marks) Answer this section first. The OMR Sheet will be collected after the first 30 minutes. There are fifteen questions in this section. 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 OMR Sheet. Read the instructions on the OMR 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 paper. Section B (30 marks) There are three questions in this section. Answer all questions. Answers to this section are to be written in the spaces provided in the question paper. Section C (35 marks) There are two questions in this section. Answer all questions. Answers to this section are to be written in the spaces provided in the question paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 24 printed pages. Write in dark blue or black pen. You may use a pencil for any diagrams or graphs. You are reminded of the need for good English and clear presentation in your answers. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Only B1 / 12 B2 / 8 B3 / 10

2 © Raffles Institution 2021 9729/J/21 [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 Use of the Data Booklet is relevant to this question. X and Y are hydrocarbons with the same empirical formula. When 0.1 mol of X and 0.1 mol of Y were combusted together in excess oxygen gas, 39.6 g of CO2 and 16.2 g of H2O were formed. The Mr of Y is two times that of X. Which row gives the correct empirical formula and molecular formula of Y? empirical formula of Y molecular formula of Y A CH C3H3 B CH C6H6 C CH2 C3H6 D CH2 C6H12 2 Under basic conditions, MnO 42− undergoes