2025 Prelim P1 (for exchange)_H2 Chem_HCI

This document consists of 15 printed pages and 1 blank page. HWA CHONG INSTITUTION C2 Preliminary Examination Higher 2 CANDIDATE NAME CT GROUP 2 4 S CENTRE NUMBER S INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice 9729/01 22 September 2025 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Complete the information on the Answer Sheet as shown below. There are thirty questions on 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 this booklet. The use of an approved scientific calculator is expected, where appropriate.

2 © Hwa Chong Institution 2025 9729/01/C2 Preliminary Examination 1 The successive ionisation energies of an element X are given below. 1st 2nd 3rd 4th 5th 6th ionisation energy / kJ mol−1 950 1800 2700 4800 6000 12300 What could be the formula of the chloride X? A XCl B XCl2 C XCl4 D XCl5 2 In which row are G and H atoms or ions of different isotopes of the same element? G H number of electrons charge nucleon number number of electrons charge nucleon number A 8 0 18 10 −2 18 B 17 +1 37 16 0 34 C 16 0 36 18 0 38 D 20 0 42 18 +2 40 3 Which pair of species has a similar shape? A AlCl3 and PCl3 B BF3 and NH3 C SF4 and XeF4 D PH4+ and BF4ˉ

3 © Hwa Chong Institution 2025 9729/01/C2 Preliminary Examination [Turn Over 4 A small bulb with a capacity of 10 m3 is connected to another with a capacity of 30 m3. Before connection, the pressure in the smaller bulb is 50 kPa and that in the larger bulb is 120 kPa. If all measurements are made at the same temperature, what is the pressure in the combined arrangement after connection? A 67.5 kPa B 85 kPa C 103 kPa D 170 kPa 5 Which statement is correct? A The relative isotopic mass of an element is the mass of one atom of an isotope of the element relative to 1 12 the mass of one atom of 12C. B The relative atomic mass of an element is the mass of one atom of the element relative to 1 12 the mass of one atom of 12C. C The relative molecular mass of a compound is the average mass of one molecule of the compound relative to the mass of one atom of 1H. D The relative formula mass of an ionic compound is the average mass of one formula unit of the ionic compound relative to the mass of one atom of 12C. 6 The relative abundance of all the isotopes present in a sample of germanium are shown.