SNGS 2024 Sec 4 Prelim P2 QP

1 Name: _________________________ ( ) Class: ___________ PRELIMINARY EXAMINATION GENERAL CERTIFICATION OF EDUCATION ORDINARY LEVEL CHEMISTRY 6092/02 Paper 2 19 August 2024 1 hour 45 minutes ____________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name, register number, and class clearly in the spaces provided at the top of this page. Write in dark blue or black pen only. You may use a soft pencil for any diagrams or graphs. Do not use highlighters, glue, and correction fluid or correction tape. Section A Answer all questions in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. A copy of Periodic Table is provided on page 22. The number of marks is given in brackets [ ] at the end of each question or part question. The use of a scientific calculator is expected, where appropriate. For Examiner’s Use Section A (70) Section B (10) Total (80) ____________________________________________________________________________ This document consists of 22 printed pages and 1 blank page. [Turn over

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3 Section A Answer all questions. 1 Use the list of substances to answer the questions. SO2 CO NH3 ZnO NO2 K2O Each substance can be used once, more than once or not at all. (a) Which covalent substance has a boiling point lower than poly(ethene) but higher than oxygen? Explain your answer in terms of bonding and structure. …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... [3] (b) Which substance can be used to make fertilizers? …………………………………………………………………………………... [1] (c) Which substance can react with both aqueous sodium hydroxide and hydrochloric acid to form salts? …………………………………………………………………………………... [1] (d) Which substance can reduce copper(II) oxide to copper? ………………………………………………………………………………….. [1] (e) Which substance consists an element with an oxidation state of -3? …………………………………………………………………………………... [1] (f) Which substance, in aqueous solution, has the highest pH? …………………………………………………………………………………... [1] [Total: 8 marks]

4 2 The following information was found on a 100PLUS can: (a) Suggest the formula of a positive ion which is found in 100PLUS, but not listed in the table above. Describe a simple test to confirm the presence of this ion. ………………………………………………