2024 Prelims DHS H2 Chem P1 (QP)

© DHS 2024 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 20 September 2024 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 16 printed pages.

2 © DHS 2024 9729/01 1 Use of the Data Booklet is relevant to this question. Which transition metal ions have the same number of unpaired electrons as a phosphorus atom in its ground state? 1 Ti2+ 2 V2+ 3 Cr3+ A 1 and 2 only B 2 and 3 only C 1 and 3 only D 1, 2 and 3 2 Use of the Data Booklet is relevant to this question. What is the order of decreasing enthalpy change for the reactions shown? Si+(g) → Si2+(g) + e− H1 Al+(g) → Al2+(g) + e− H2 Si(g) → Si2+(g) + 2e− H3 A H1 > H2 > H3 B H2 > H3 > H1 C H3 > H1 > H2 D H3 > H2 > H1

3 © DHS 2024 9729/01 [Turn over 3 Analysis of a mixture of sulfur-containing gases shows that hydrogen sulfide, H 2S, and carbon disulfide, CS2, are present in a 2 : 1 mole ratio. The mixture is burned in excess oxygen. Which row describes: • the SO2 : CO2 mole ratio in the mixture obtained after complete combustion, • the relative deviation from ideal behaviour of the gases, CO2 and CS2? SO2 : CO2 mole ratio relative deviation A 3 : 1 CS2 deviates more than CO2 B 4 : 1 CS2 deviates more than CO2 C 3 : 1 CO2 deviates more than CS2 D 4 : 1 CO2 deviates more than CS2 4 The table shows the melting points of two ionic compounds. compound melting point / °C CaO 2613 NaF 993 Which statement helps to explain the relative melting points of CaO and NaF? A Ca2+ has a larger ionic radius than Na+. B Ca2+ has a higher charge density than Na+. C The sum of ionic radii is larger for CaO than NaF. D The ionic charges are larger in magnitude for CaO than NaF. 5 How many of the molecules listed are polar and have the same shape? • NCl3 • HCN • BeCl2 • SOCl2 A none B 2 C 3 D 4

4 © DHS 2024 9729/01 6 A student carries out an investigation using a mixture of Period 3 oxides, X and Y. All experiments are carried out at room temperat