2022 EJC Prelims Paper 1_QP

© EJC [Turn Over EUNOIA JUNIOR COLLEGE JC2 Preliminary Examination 2022 General Certificate of Education Advanced Level Higher 2 CHEMISTRY Paper 1 Multiple Choice 9729/01 22 September 2022 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, civics group and registration number on the Answer Sheet in the spaces provided unless this has been done for you. There are thirty 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 12 printed pages.

2 © EJC 9729/01/J2Prelims/22 1 The hardness present in a water sample due to dissolved calcium ions can be determined by using an ion-exchange column. A 50 cm 3 sample of a solution containing calcium sulfate was passed through the ion - exchange resin. The calcium ions in the sample were quantitatively exchanged by hydrogen ions. The sample collected after passing through the resin required 25 cm 3 of 1.0 × 10−2 mol dm−3 potassium hydroxide for complete neutralisation. What was the concentration of the calcium sulfate in the original sample? A 2.5 × 10−3 mol dm−3 B 5.0 × 10−3 mol dm−3 C 2.0 × 10−2 mol dm−3 D 1.0 × 10−2 mol dm−3 2 Use of the Data Booklet is relevant to this question. The table below shows the fifth, sixth, seventh, eighth and ninth ionisation energies of an element, which is either in the third or fourth period. 5th 6th 7th 8th 9th ionisation energy / kJ mol–1 6 500 9 400 11 000 33 600 38 600 Which element has these ionisation energy values? A As B Se C Cl D Ar 3 Bromine trifluoride is a liquid which undergoes auto -ionisation at room temperature as represented by the following equation: 2BrF 3  BrF + 2 + BrF ― 4 Which of the following is correct regarding BrF 3, BrF + 2 and BrF ― 4 ? A BrF 3 is planar while BrF ― 4 is non-planar. B BrF + 2 is linear while BrF ― 4 is tetrahedral in shape. C The F–Br–F bond angle in BrF 3 is smaller than that in BrF ― 4 . D There are more lone pairs of electrons around the Br atom in BrF 3 than that in BrF + 2 .

3 © EJC 9729/01/J2Prelims/22 [Turn over 4 E and F are both ideal gases, and the relative molecular mass of E is half that of F. Which graph is obtained when pV is plotted against T for equal masses of the two gases? A B C D 5 Changes in temperature can affect the spontaneity of a reaction. W