2024 MI PU3 H2 Chem EOY P1 student (final)

Class Adm No Candidate Name: This question paper consists of 12 printed pages and 2 blank pages. 2024 Preliminary Examinations Pre-University 3 H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 18 Sep 2024 1 hour Additional materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not turn over this question paper until you are told to do so. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. At the top of this page: Write your name, class and admission number in the spaces provided. On the Answer Sheet: Write your name, class and subject. Write your identification number and shade the corresponding bubbles. Ther 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 booklet. The use of an approved scientific calculator is expected, where appropriate. FOR EXAMINER’S USE TOTAL (30 marks)

2 For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Which of the following statements are correct about 1 mole of C(s)? 1 It contains 6.02 x 10²³ carbon atoms. 2 It has a mass of 12.0 g. 3 It contains 12 moles of electrons. 4 It occupies a volume of 24.0 dm³ at room temperature and pressure. A 1 and 2 only B 3 and 4 only C 1, 2 and 3 only D 2, 3 and 4 only 2 A painkiller pill contains 500 mg of acetaminophen, C₈H₉NO₂. acetaminophen What is the mass of nitrogen present in one pill? [1 g = 1000 mg] A 0.046 g B 0.093 g C 0.151 g D 0.700 g 3 Ammonia reacts with boron trifluoride in the following equation. NH₃ + BF₃ → BF₃.NH₃ What is the role of NH₃ in the reaction? A Brønsted-Lowry acid B Brønsted-Lowry base C Lewis acid D Lewis base

3 [Turn over 4 When excess potassium iodide, KI, is added to potassium iodate(V), iodine is produced. IO₃⁻ + 5I⁻ + 6H⁺ → 3I₂ + 3H₂O Which of the following statements is incorrect about the reaction? A Iodine in IO₃⁻ was reduced. B Iodine in I⁻ was oxidised. C The reaction is a disproportionation reaction. D The oxidation number of iodine in I₂ is 0. 5 Which of the following statements is not true of an element in Period 3? A It has electrons in the spherically shaped orbitals. B It has three dumb-bell shaped orbitals in its outermost shell. C It has five orbitals with four lobes in each orbital. D It is able to accommodate more than 8 electrons in its outermost shell. 6 A beam of Na+ 11 23 ions were passed through an electric field and it was found to deflect by an angle of +8.5º. What is the angle of deflection for a beam of P3− 15 31 ions travelling at the same speed through the same electric field? A –34.4º B –18.9º C –18.7º D –3.8º 7 Which of the following correctly describe the structure and bonding in carbon? 1 It contains strong C–C covalent bonds. 2 It can contain weak instantaneous dipole-induced dipole forces of attraction. 3 It can have a giant lattice structure. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

4 8 An unknown element J exists as a liquid at 35 ˚C and is electrically conductive in both the solid and liquid states. Another unknown element K exists as a gas at 35 ˚C and does not conduct electricity in both the solid and liquid states. Which of the following statements are false about the compound formed between J and K? A It could conduct electricity in the molten state. B It could exist as non-polar molecules. C It could have the formula JK₂. D It could contain delocalised electrons. 9 Which of the following statements correctly describe ideal gas behaviour? A 1 mol of oxygen gas occupies 22.7 dm³ at room temperature and pressure. B 1.06 mol of carbon dioxide gas occupies 24.0 dm³ at standard temperature and pressure. C At low temperatures, nitrogen gas turns into a liquid. D At constant pressure, concentration of hydrogen gas increases when temperature increases. 10 In an isolated system, a 2.5 dm³ vessel containing neon gas at –43 ˚C and 80 kPa was connected to a 5.5 dm³ vessel containing helium gas at –97 ˚C and 39 kPa. The valve was opened and the gases were allowed to mix. The final pressure of the mixture was found to be 59 kPa. Assuming ideal gas behaviour, what is the final temperature of the mixture? A –18 ˚C B –47 ˚C C –70 ˚C D –116 ˚C 11 Which of the following equations represents the standard enthalpy change of atomisation of the species? A ½Br₂(g) → Br(g) B Hg(l) → Hg(g) C H₂O(l) → H₂O(g) D Na(s) → Na⁺(g)

5 [Turn over 12 Which of the following statements help to explain why the enthalpy change of solution of sodium chloride is endothermic? A The lattice energy is more exothermic than the sum of the hydration energies of the ions. B The lattice energy is less exothermic than the sum of the hydration energies of the ions. C The energy released from the formation of ion -dipole interactions is sufficient to overcome the ionic bonds. D The energy released from the formation of ion -dipole interactions is insufficient to overcome the ionic bonds. 13 Consider the following reaction mechanism. Which of the following statements about the reaction is incorrect? A CH₂N₂ acts as an electrophile. B CH₂N₂ acts as a Lewis base. C CH₂N₂ acts as a nucleophile. D It is a substitution reaction. 14 Which of the following statements are true about orphenadrine? orphenadrine 1 It can exhibit enantiomerism. 2 It has a pKₐ that is greater than 7 at 25 ˚C. 3 It has the molecular formula C₁₆H₂₃NO. A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3

6 15 Which of the following products will be formed when prop -2-enylbenzene is mixed with cold Br₂ in CCl₄, in the presence of UV light? prop-2-enylbenzene A B C D 16 Which of the following statements are true about benzene? 1 The C–C bond has a bond order of between 1 and 2. 2 It is able to conduct electricity due to delocalised electrons. 3 It is a planar molecule with all bond angles being 120˚. 4 It undergoes addition reactions readily due to its C=C double bonds. A 1 and 3 only B 2 and 4 only C 3 and 4 only D 1, 2 and 3 only 17 Chloroethane is heated with NaOH separately in aqueous and ethanolic medium, producing the major products Q and T respectively. Which of the following statements is true about Q and T? A The Mᵣ of Q is heavier than the Mᵣ of T by 18.0. B Both Q and T are polar covalent compounds. C Q has a non-superimposable mirror image. D T has hydrogen bonding between its molecules.

7 [Turn over 18 Miconazole cream is used to treat fungal skin infections. Which of the following statements are true about miconazole? [The C–O–C group is considered inert.] A There is p-orbital overlap between the atom Na and π electron cloud adjacent to it. B When boiled with NaOH(aq), cooled and neutralised with HNO ₃(aq), it gives a white precipitate upon addition of AgNO₃(aq). C The Na atom on miconazole acts as a stronger base than Nb. D The product of hydrolysis gives a dark colouration with neutral FeCl₃(aq). 19 The radioactive decay of ²¹²Pb into ²¹²Bi has a half-life of 10.6 hours. Given that radioactive decay observes first-order kinetics, how much time does it take for 85% of a ²¹²Pb sample to be converted to ²¹²B