EJC Prelim H1 Chemistry Paper 1 QP

© EJC [Turn Over EUNOIA JUNIOR COLLEGE JC2 Preliminary Examination 2025 General Certificate of Education Advanced Level Higher 1 CHEMISTRY Paper 1 Multiple Choice 8873/01 19 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. Write your name, civics group and registration number on the Answer Sheet in the spaces provided unless this has been done for you. 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 question paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 14 printed pages and 2 blank pages.

2 © EJC 8873/01/J2PE/20 1 In which pair of atoms, in their ground states, have the same number of unpaired electrons? A B and Ca B F and Na C Ne and P D Be and Si 2 Three particles approach an electric field at the same speed. They are deflected as they pass through the electric field. What could be the identities of particles X, Y and Z? X Y Z A 35 17Cl– 37 17Cl– 23 11Na+ B 6 3Li+ 7 3Li+ 1 1H– C 37 17Cl– 35 17Cl– 23 11Na+ D 7 3Li+ 6 3Li+ 1 1H– 3 Which molecule has the largest bond angle? A BF3 B SiCl4 C H2S D PH3 + – X Y Z

3 © EJC 9729/01/J2PE/25 [Turn over 4 The boiling points of hydrogen chloride, HCl, and chlorine, Cl2 are shown in the table. boiling point / ºC HCl −85 Cl2 −34 Which pair of statements explain this difference? 1 The forces of attraction between C l2 molecules are instantaneous dipole- induced dipole attractions. 2 The force s of attraction between HC l molecules are permanent dipole - permanent dipole attractions. 3 H−Cl bonds are stronger than Cl−Cl bonds. 4 The forces of attraction between C l2 molecules are stronger because C l2 molecules have more electrons. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4 5 Which of the following molecule will not form a hydrogen bond with another of its own molecule? A CH3CHO B CH3NH2 C CH3OH D HF 6 Gases can be liquefied under certain conditions. Which statement best describes why a gas liquefies under high pressure? A Increasing the pressure causes the temperature of the gas to decrease to below its boiling point. B Increasing the pressure decreases the kinetic energy of the molecules, creating the ordered liquid state. C Increasing the pressure decreases the size of the molecules , and so the intermolecular forces of attraction become stronger. D Incre