USS 2024 P2 6092 ANS

USS PRELIM 2024/6092/01 Pure Chemistry Page 1 of 18 UNITY SECONDARY SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR CHEMISTRY 6092/01 Paper 1 Multiple Choice 22 Aug 2024 1 hour Additional Materials: Multiple Choice Answer Sheet MARKS /40 READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluids. Write your Name, Form Class, Index Number and Teaching Group on the Question Paper and Answer Sheet in the spaces 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 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. A copy of the Periodic Table is printed on page 18. The use of an approved scientific calculator is expected, where appropriate. This paper consists of 18 printed pages, including this cover page. [Turn over Name: Form Class Index No Teaching Group O

USS PRELIM 2024/6092/01 Pure Chemistry Page 2 of 18 1 A student follows the rate of the reaction when 0. 08 g of magnesium reacts with excess hydrochloric acid at room temperature and pressure. What is most suitable for measuring the volume of gas produced at different times during the experiment? A a 50 cm3 gas syringe B an inverted 50 cm3 burette filled with water C an inverted 100 cm3 measuring cylinder filled with water D place the apparatus on a balance and measure the loss in mass 2 A student uses paper chromatography to find an Rf value for Fe3+(aq). The result is shown below. To make the spot containing Fe3+(aq) more visible, the paper is sprayed with aqueous sodium hydroxide so that a precipitate of iron(III) hydroxide forms. Under the conditions of the experiment, the Rf value of Fe3+(aq) is given by …..1….. and the colour of the precipitate is …..2….. Which row correctly completes gaps 1 and 2? gap 1 gap 2 A x y green B x y red-brown C y x green D y x red-brown solvent front start line Fe3+ y x

USS PRELIM 2024/6092/01 Pure Chemistry Page 3 of 18 3 Three separations are listed. 1 obtaining ethanol from the fermentation of glucose 2 obtaining nickel from a solid mixture of iodine and nickel 3