YCKSS Prelim P2

Name: Index Number: Class: YIO CHU KANG SECONDARY SCHOOL O-LEVEL PRELIMINARY EXAMINATION 2024 SECONDARY FOUR EXPRESS CHEMISTRY 6092/02 Paper 2 1 hour 45 minutes 28 August 2024 (Wednesday) No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, index number and class on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 24. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use Section A / 70 Section B / 10 Total / 80 Setter: Mdm Connie Yeo This document consists of 22 printed pages and 2 blank pages.

2 4E PRELIM EXAM 2024 6092/02 Section A [70 marks] Answer all the questions in this section in the spaces provided. A1 The diagram shows part of the Periodic Table. Answer these questions using only the elements shown in the diagram. Each element can be used once, more than once or not at all. Write the symbol for (a) an element which is in Group 14 and Period 3, ..………...….. [1] (b) an element which is used to fill light bulbs and in the manufacture of steel, ……………… [1] (c) an element whose ions in aqueous solution gives a yellow precipitate on reaction with aqueous silver nitrate, ……………… [1] (d) an element which forms an ion of type Y3-, ……………… [1] (e) an element which is a catalyst for the hydrogenation of alkenes, ……..……… [1] (f) two elements which combine to form a compound which causes acid rain. ..……… and ………… [1] [Total: 6]

3 4E PRELIM EXAM 2024 6092/02 A2 The graph below shows how the pH changes when aqueous sodium hydroxide is added slowly to 5.0 cm3 of 0.100 mol/dm3 sulfuric acid until the alkali is in excess. (a) Calculate the concentration of sodium hydroxide solution that compl