2025 DHS H2 Chem Prelim Paper 1_QP

© DHS 2025 9729/01 [Turn over Name: Centre/Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination Year 6 H2 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 9729/01 25 September 2025 1 hour READ THESE INSTRUCTIONS FIRST Write your centre number, index number, name and class at the top of this page. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. 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. This document consists of 12 printed pages.

2 © DHS 2025 9729/01 1 In two separate experiments, a beam of alpha particles ( 4He2+) and a beam of charged particles X were fired with equal velocities into an electric field. + _ beam of particles The angle of deflection of the charged particles, 4He2+ and X, was found to be + 1 and +6 respectively. Which statement is correct? A X is negatively charged. B X travels in a straight path towards one of the charged plates. C X could be a 12C+ ion. D None of the above. 2 Use of the Data Booklet is relevant to this question. W is an isotope of an element. An isotope of strontium has a nucleon number of 84 and the same number of neutrons in the nucleus as the isotope W. The species Sr2+ and W contain the same number of electrons. What is the nucleon number of W and how many orbitals are occupied in its valence shell? W number of orbitals occupied in valence shell A 80 3 B 82 4 C 82 3 D 84 4

3 © DHS 2025 9729/01 [Turn over 3 The molecules CO2, CS2 and COS have the same shape. Which statements are correct? 1 The molecules all contain polar covalent bonds. 2 The molecules each contain two sigma and two pi bonds. 3 Only COS has permanent dipole–permanent dipole interactions. 4 COS has stronger instantaneous dipole–induced dipole interactions than CS2. A 1, 2 and 3 only B 2 and 4 only C 2 and 3 only D 1 and 4 only 4 Which row correctly describes the structure and bonding present in the solid lattice of the given substance? substance structure bonding A ice giant molecular covalent and hydrogen bonding B iodine simple molecular covalent bonding and permanent dipoles C sodium nitrate giant ionic ionic and covalent bonding D manganese giant metallic ionic bonding 5 Analysis of a mixture of sulfur –containing gases shows that hydrogen sulfide, H 2S, and carbon disulfide, C