2024 Prelims EJC H2 Chem P1 (QP)

© EJC [Turn Over EUNOIA JUNIOR COLLEGE JC2 Preliminary Examination 2024 General Certificate of Education Advanced Level Higher 2 CHEMISTRY Paper 1 Multiple Choice 9729/01 18 September 2024 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/J2PE/24 1 A gravimetric analysis of a sample of an iron ore was carried out. 0.6 g of ore was dissolved in perchloric acid to oxidise the iron to Fe 3+. The resultant solution was filtered to remove solid impurities and made basic to precipitate the Fe3+ as the hydroxide. The precipitate was filtered and heated to produce 0.32 g of Fe2O3. What is the percentage by mass of iron in the ore? A 18.6% B 37.3% C 53.0% D 69.9% 2 Ions of element Y can exist in variable oxidation states. 25.0 cm 3 of 0.400 mol dm –3 Y2+ solution requires 40.00 cm3 of 0.100 mol dm–3 acidified KMnO4 for a complete reaction. What is the final oxidation state of Y? A +4 B +3 C 0 D −1 3 Which of the following ions would experience the greatest angle of deflection in its path when passing through the same electric field? A 24Mg+ B 48Ti3+ C 59Co2+ D 101Ru4+ 4 Which of the following shows the correct shape and bond angle of the molecule given? molecule shape bond angle A OF2 bent 117º B BF3 trigonal pyramidal 120º C XeF4 tetrahedral 109.5º D SF6 octahedral 90º

3 © EJC 9729/01/J2PE/24 [Turn over 5 Ideal gases K and L, initially at different pressures and temperatures, are placed in different bulbs that are connected by a narrow tube of negligible volume as shown. When the tap is opened, the gases mix. What is the final pressure of the mixture if both bulbs are maintained at 227 ºC? A 28.0 kPa B 30.0 kPa C 36.6 kPa D 68.6 kPa 6 The enthalpy changes involved in the formation of KC l(aq) from K(s) and C l2(g) are as follows: Which of the following statements are correct? 1 The lattice energy of potassium chloride is ∆H3. 2 The enthalpy change of solution of potassium chloride is (∆H3 + ∆H4). 3 The enthalpy change of formation of solid potassium chloride is (∆H1 + ∆H2 + ∆H3). A 1 only B 1 and 3 on