2024 Kranji Sec Pure Chem P2

Candidate Name: __________________________ ( ) Class: _________ KRANJI SECONDARY SCHOOL Preliminary Examination Secondary 4 Express CHEMISTRY 6092/02 Paper 2 Monday 19 August 2024 1 hr 45 min KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI 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. 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 22. The use of an approved scientific calculator is expected, where appropriate. Set by: Mrs Toh-Chong Keting This Question Paper consists of 22 printed pages. [Turn over 4E Session 1 For Examiners’ Use Section A 70 Section B 10 Total 80

2 Section A (70 marks) Answer all the questions in this section in the spaces provided. The total mark for this section is 70. A1 The following solutions are commonly found in a science laboratory. Ba(NO3)2 H2SO4 NH3 KI AgNO3 CuSO4 Ca(OH)2 NH4Cl HNO3 Use the list above to answer the following questions. You may use each solution once, more than once or not at all. (a) Which two solutions have a pH that is more than 7? ................................................. and ................................................................... [1] (b) Which solution gives a light blue precipitate with aqueous sodium hydroxide? .............................................................................................................................. [1] (c) Which two solutions give a yellow precipitate when mixed? ................................................. and ................................................................... [1] (d) Which solution turns brown when acidified potassium manganate(VII) is added? .............................................................................................................................. [1] (e) Which solution can be added to treat soil that is too acidic? ........