2025 CCHY Prelim P1 QP

This document consists of 20 printed pages, INCLUDING the cover page. [Turn over 2025 Preliminary Examination Secondary Four Express CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 6092/01 Paper 1 Multiple Choice 20 August 2025 Additional Materials: OTAS 1 hour READ THESE INSTRUCTIONS FIRST Write your name, class and index number in the spaces at the top of this page and on the OTAS provided. There are forty 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 OTAS. Read the instructions on the OTAS 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. A copy of the Periodic Table is printed on page 20. The use of an approved scientific calculator is expected, where appropriate. O CHUNG CHENG HIGH SCHOOL (YISHUN)

2 CCHY 2025 6092/01/Sec4Express/Prelim/2025 [Turn over 1 A student follows the rate of reaction between marble chips, CaCO 3 and dilute hydrochloric acid. CaCO3 + 2HCl → CaCl2 + CO2 + H2O Which set-ups show the apparatus that are suitable for this experiment? A 1 and 2 only B 1 and 3 only C 2 and 4 only D 1, 2 and 4 only hydrochloric acid marble chips measuring cylinder water hydrochloric acid marble chips balance loose plug hydrochloric acid hydrochloric acid burette burette marble chips marble chips gas syringe

3 CCHY 2025 6092/01/Sec4Express/Prelim/2025 [Turn over 2 A student set s up the apparatus as shown below to collect a sample of clean, dry gas X. Which row correctly gives the identity of gas X and drying agent? gas X drying agent A ammonia calcium oxide B ammonia concentrated sulfuric acid C hydrogen chloride calcium oxide D hydrogen chloride concentrated sulfuric acid 3 Which sequence of procedures is used to separate a pure, dry sample of hydrated copper(II) sulfate, CuSO4.5H2O, from a mixture containing hydrated copper(II) sulfate and calcium carbonate, CaCO3? A dissolve in water → distillation → crystallisation B dissolve in water → filtration → crystallisation C distillation → crystallisation → heating to remove all water D fractional distillation → filtration → heating to remove all water dry sample of gas X mixture of ammonium chloride and calcium hydroxide drying agent

4 CCHY 2025 6092/01/Sec4Express/Prelim/2025 [Turn over 4 A paper chromatography experiment is used to find the R f value for Fe 2+(aq). The chromatogram is shown. To m