2024 TMJC H1 Chem Prelim P1 (QP)

___________________________________________________________________ H1 CHEMISTRY 8873/01 Paper 1 Multiple Choice 19 September 2024 1 hour Additional materials: Multiple Choice Answer Sheet Data Booklet _________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write in soft pencil. Write your name, class and register number on the Answer Sheet in the spaces provided. There are thirty questions in this section. Answer all questions. For each question, there are four possible answers labelled A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read very carefully the instructions on the use of Answer Sheet. You are advised to fill in the Answer Sheet as you go along; no additional time will be given for the transfer of answers once the examination has ended. This document consists of 12 printed pages. Use of Answer Sheet Ensure you have written your name, class register number and class on the Answer Sheet. Use a 2B pencil to shade your answers on the Answer Sheet; erase any mistakes cleanly. Multiple shaded answers to a question will not be accepted. For shading of class register number on the Answer Sheet, please follow the given examples: If your register number is 1, then shade 01 in the index number column. If your register number is 21, then shade 21 in the index number column. TAMPINES MERIDIAN JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION

2 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H1 Chemistry 1 Use of the Data Booklet is relevant to this question. A stream of gaseous Ca2+ 20 40 charged ions was passed through an electric field between two oppositely charged plates and the Ca2+ ions were deflected at an angle of +15.0°. Under the same electric field, a stream of unknown gaseous X3− ion was deflected at an angle of −29.0°. What is a possible atomic number of X? A 15 B 24 C 31 D 34 2 Which of these statements correctly describes an electron shell with the principal quantum shell number n = 2? 1 A total of 10 electrons can be accommodated in this shell. 2 An orbital from this shell must be dumb-bell in shape. 3 The energy level of the orbitals in this shell is higher than that in n = 1. A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 3 only 3 Use of the Data Booklet is relevant to this question. The first ionisation energy of beryllium is greater than the first ionisation energy of boron. Which factor explains this? A charge on the nucleus B distance from the nucleus to the outer electrons C removal of electron is from a lower energy orbital D repulsion between electrons in an orbital 4 Which of the following does not contain hydrogen bonding? A NH3(l) B NH4Cl(l) C (CH3)2NH(l) D CH3CONH2(l) 5 The CO2 molecule is linear. What is the number of  and  bonds present in the molecule?   A 1 3 B 2 2 C 3 1 D 4 0

3 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H1 Chemistry 6 The table identifies the shape and polarity of four molecules. Which row is correct? molecule molecular shape polarity A bromine trifluoride bent polar B phosphorus trichloride trigonal pyramidal polar C sulfur dichloride linear non-polar D trifluoromethane tetrahedral non-polar 7 The table shows four species with their corresponding physical properties. Which species does not correspond to its description of physical properties? species physical properties A copper high melting point, conducts electricity when solid and when molten B silicon dioxide high melting point, does not conduct electricity in any state C aluminium bromide high melting point, conducts electricity when molten but not when solid D phosphorus pentachloride low melting point, does not conduct electricity in any state 8 Which of the following is not an acid-conjugate base pair? A HCl and NaCl B Na2HPO4 and H3PO4 C H2O2 and HO2− D CH3CH2NH2 and CH3CH2NH3Cl

4 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H1 Chemistry 9 Which one of the following acid solutions can be used to give an effective buffer solution by partial neutralisation with aqueous NaOH? A HCOOH B HCl C HI D HNO3 10 The graph shown can be plotted for the titration of aqueous ethanoic acid with potassium hydroxide. Which species are present in the solution at point X? 1 ethanoic acid 2 potassium hydroxide 3 potassium ethanoate A 1 and 2 only B 1 and 3 only C 2 and 3 only D 3 only 11 Which pair of statements is correct for Group 1 elements and their reducing strength? reducing strength reason A decreases down the Group valence electron more easily lost B decreases down the Group valence electron more easily gained C increases down the Group valence electron more easily lost D increases down the Group valence electron more easily gained 0 volume of KOH added pH X

5 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H1 Chemistry 12 Use of the Data Booklet is relevant to this question. Which of the following shows the correct trends when the melting points of the elements, Mg, Al, Si and P are plotted against their atomic radii? 13 Which statement is correct about the halogens (X2) chlorine, bromine and iodine as well as their corresponding hydrogen halides (HX)? A The colour intensity of the halogens decreases from Cl2 to I2. B The oxidising power of the halogens decreases from Cl2 to I2. C The thermal stability of HX increases from HCl to HI. D The volatility of HX increases from HCl to HI. 14 1 dm3 of a gaseous hydrocarbon was mixed with excess oxygen. When the mixture undergoes complete combustion, the volume contracted by 2 dm 3. When the resultant mixture was passed through concentrated sodium hydroxide, the gas volume further decreased by 2 dm3. All volumes were measured at room temperature and pressure. What is the empirical formula of the hydrocarbon? A CH B CH2 C C2H3 D C3H4 A B C D

6 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H1 Chemistry 15 In this question, only V and Zn undergo changes in oxidation numbers. Vanadium oxide, V2O5, reacts with zinc in the presence of acidic medium. Zn is oxidised to Zn2+ and 3 moles of Zn react with 1 mole of V2O5. What is the final oxidation number of V in the vanadium containing product of this reaction? A 0 B +1 C +2 D +3 17 Substances X and Y react to form product Z. 2X + Y → 2Z The reaction was studied and the following data were obtained. experiment [X] / mol dm−3 [Y] / mol dm−3 initial rate / mol dm−3 min−1 1 0.10 0.10 0.020 2 0.20 0.10 0.080 3 0.15 0.23 0.045 What is the order of reaction with respect to X and Y? A First order with respect to X and zero order with respect to Y. B Second order with respect to X and first order with respect to Y. C First order with respect to X and first order with respect to Y. D Second order with respect to X and zero order with respect to Y. 16 Chromates such as sodium chromate, Na2CrO4, are used in chrome plating to protect metals and can be manufactured by heating iron(II) chrom ite, FeCr 2O4, with sodium carbonate in air. 4FeCr2O4 + 8Na2CO3 + 7O2 → 8Na2CrO4 + 2Fe2O3 + 8CO2 Which species are oxidised and reduced in this process? species oxidised species reduced A chromium and iron carbonate ion and oxygen B chromium and iron oxygen only C iron only carbonate ion only D chromium only ca