MSHS Chem Prelim P1

Class/ Index Number / Centre Number/ ‘O’ Level Index Number / Name MARIS STELLA HIGH SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR CHEMISTRY 6092/01 Paper 1 Multiple Choice 3 September 2025 1 hour Additional Materials: Optical Test Answer Sheet (OTAS) – 1 sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your class, index number, Centre number, O level index number and name in the spaces at the top of this page. 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 answer 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 question booklet. A copy of the Periodic Table is printed on page 15. The use of an approved scientific calculator is expected, where appropriate. The total number of marks for this paper is 40. At the end of the examination, hand in the following separately: (1) Optical Test Answer Sheet (OTAS)
 (2) Question Paper This document consists of 15 printed pages.

2 1 The apparatus can be used to show the diffusion of gases. Air is present in the porous tube. The beaker is filled with hydrogen. Assume all gases are at the same temperature and pressure. What would happen to the water level at X over time? A The water level at X will remain unchanged. B The water level at X will drop and remains there. C The water level at X will drop and then return to its original position. D The water level at X will rise and then return to its original position. 2 The table shows some mixtures and their constituents are obtained using suitable separation techniques. mixture constituent obtained 1 NaCl(aq) H2O(l) 2 I2(s) and Ni(s) I2(s) 3 NaCl(aq) NaCl(s) Which row gives the correct separation techniques to obtain the constituents from the mixture? 1 2 3 A distillation sublimation evaporation B distillation sublimation filtration C filtration crystallisation evaporation D sublimation crystallisation filtration 3 An element, Z, has p protons and n neutrons in its nucleus. Which row gives a possible correct number of protons, neutrons and electrons in a negative ion of an isotope of Z? protons neutrons electrons A p n+1 p+1 B p n+1 p−1 C p+1 n p+1 D p+1 n p−1 X beaker filled with hydrogen porous tube air

3 4 The proton numbers of elements X, Y and Z are 6, 8 and 12 respectively. Which row shows the correct formulae of the compounds formed between the elements? compound 1 compound 2 compound 3 A Z2Y XY ZXY3 B ZY XY2 ZXY3 C ZY XY2 ZXY