SJI 2023 Y4 Prelim Chemistry Paper 1

1 ST JOSEPH’S INSTITUTION PRELIMINARY EXAMINATION 2023 (YEAR 4) CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Additional Materials: Multiple Choice Answer Sheet 6092/01 29 August 2023 1 hour (08:05 – 09:05) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, index number and class on the 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 Question paper. A copy of the Periodic Table is printed on page 2 of this question paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 17 printed pages including this cover page.

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3 1 A gas dissolves readily in water, turns moist blue litmus paper red, and is denser than air. Which set-up should be used to dry and collect this gas? A B C D 2 Leo accidentally contaminated a sample of pure lead(II) sulfate with a small amount of lead(II) carbonate. Which sequence of steps would help Leo re-obtain pure lead(II) sulfate? A add excess hydrochloric acid, filter, crystallise, then rinse and dry B add excess hydrochloric acid, filter, then rinse and dry C add excess nitric acid, filter, crystallise, then rinse and dry D add excess nitric acid, filter, then rinse and dry calcium oxide gas gas concentrated sulfuric acid gas water calcium oxide gas concentrated sulfuric acid

4 3 Excess aqueous ammonia is added to a solution containing aluminium ions, copper(II) ions and zinc ions. The mixture is then filtered. Which ion(s) will be found in the resulting residue? A aluminium ions B aluminium ions and zinc ions C copper(II) ions D copper(II) ions and zinc ions 4 Billy studied the rate of d iffusion of ammonia gas and hydrogen chloride gas using the set-up shown below. A white ring of solid was formed at position Z. Billy repeated the experiment using concentrated hydrobromic acid instead of hydrochloric acid. A white ring of solid was formed at another position, W. Which statement is not true? A Ammonia gas diffuses faster than hydrogen chloride gas. B Conducting both experiments at a higher temperature will not change positions W and Z. C Hydrogen bromide gas i