Greendale 6092/01 Chem Paper 1 QNs Prelim 2024

1 GREENDALE SECONDARY SCHOOL Preliminary Examination 2024 STUDENT NAME CLASS 4 TEACHING GROUP REG. NO CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6092/01 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class, teaching group and register number in the spaces provided above and on the Multiple Choice Answer Sheet 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 20. The use of an approved scientific calculator is expected, where appropriate This document consists of 20 printed pages. [Turn over

2 1 A student is provided with two drying agents: concentrated sulfuric acid and calcium oxide. Which method should he use to collect a sample of dry ammonia? [Mr: NH3, 17] 2 Which ion contains the same number of electrons as Fe26563+? A Co27593+ B Cr24522+ C Mn25562+ D Mn25553+ dry ammonia dry ammonia dry ammonia dry ammonia moist ammonia moist ammonia moist ammonia moist ammonia calcium oxide calcium oxide concentrated sulfuric acid concentrated sulfuric acid A B C D

3 3 The chromatogram of substance S is shown. Some distances, W, X, Y and Z, are labelled on the diagram. How is the Rf value of substance S calculated? A XY B WZ C YX D YW 4 Small crystals of purple KMnO4 (Mr = 158) and orange K2Cr2O7 (Mr = 294) were placed at the centres of separate petri dishes filled with agar jelly. They were left to stand under the same physical conditions. After some time, the colour of each substance had spread out as shown. The lengths of the arrows indicate the relative distances travelled by particles of each substance. Which statement is correct? A Diffusion is faster in dish 1 because the mass of the particles is greater. B Diffusion is faster in dish 2 because the mass of the particles is greater. C Diffusion is slower in dish 1 because the mass of the particles is smaller. D Diffusion is slower in dish 2 because the mass of the particles is greater. solvent front substance S baseline solvent level W X Z Y dish 1 dish 2 KMnO4 K2Cr2O7

4 5 A compound, XY4, is shown below. Both atoms of elements X and Y combine to obtain the electronic configuration of neon. Which row shows the correct group of elements X and Y and the number of non-bonding electrons in one molecule of XY4? group of X group of