2025 RI H2Chem Prelims P1 Questions

© Raffles Institution 2025 9729/01/S/25 [Turn Over RAFFLES INSTITUTION 2025 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 26 September 2025 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, glue or correction fluid. Write your name, class and index number in the spaces provided on the Answer Sheet. There are thirty questions in this paper. 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 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 the question booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 13 printed pages and 1 blank page.

© Raffles Institution 2025 9729/01/S/25 [Turn Over 2 1 Use of the Data Booklet is relevant to this question. What are the numbers of electrons and neutrons in the 37Cl+ ion? electrons neutrons A 16 20 B 16 37 C 17 20 D 17 37 2 In two separate experiments, a beam of 17O+ ions and a beam of [16O18O]2– ions, travelling at the same velocity, pass through an electric field as shown. Which statements are correct? 1 The [16O18O]2– ions are deflected to a larger extent than the 17O+ ions. 2 The [16O18O]2– ions are deflected in the opposite direction to the 17O+ ions. 3 The beam of 17O+ ions travels in a straight path towards the negatively charged plate. A 1 and 2 B 1 and 3 C 2 and 3 D 2 only beam of particles + –

© Raffles Institution 2025 9729/01/S/25 [Turn Over 3 3 The table shows the structural formulae of three compounds. compound P Q R structural formulae CH3CH2CH2CH3 What is the correct order of increasing boiling point of these compounds? A P → Q → R B P → R → Q C R → P → Q D R → Q → P 4 Beryllium is the first member of Group 2 and forms covalent compounds which are said to be electron deficient. In many ways, beryllium resembles aluminium. Which statement regarding compounds of beryllium is correct? A BeF2 acts as a Lewis base when it reacts with NH3 to form the BeF2 • NH3 adduct. B BeF2 • NH3 is a planar molecule. C BeF42– contains two co-ordinate bonds. D The n polymer cannot form hydrogen bonds with H2O.

© Raffles Institution 2025 9729/01/S/25 [Turn Over 4 5 Which graph correctly describes the behaviour of a fixed mass of an ideal gas? [T is measured in K.] A B C D 6 Elements X, Y and Z are in Period 3 of the Pe