MI Prelim H1 Chem P1 QP for exchange

Class Adm No Candidate Name: This question paper consists of 13 printed pages and 1 blank page 2025 Preliminary Examination Pre-University 2 H1 CHEMISTRY 8873/01 Paper 1 Multiple Choice 17 September 2025 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. Write your name, class and admission number in the spaces provided at the top of this page and on the Multiple Choice Answer Sheet provided. 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 Multiple Choice Answer Sheet provided. Read the instructions on the Multiple Choice 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. FOR EXAMINER’S USE TOTAL (30 marks) H

2 1 Which of the following statements about 1 mol of a gas is always correct? A It has the same mass as any gas with 6.02 × 1023 molecules. B It has the same number of atoms as 1 mol of hydrogen gas. C It occupies the same volume as 1 mol of H2S gas under the same conditions. D It contains the same number of particles as 1 12 g of 12C. 2 In an experiment, 50 cm3 of a 0.1 mol dm−3 solution of a metallic salt reacts exactly with 25 cm3 of 0. 1 mol dm −3 aqueous sodium sulfite, Na 2SO3. The half -equation for the oxidation of the sulfite ion is shown below: SO32−(aq) + H2O(l) ⟶ SO42−(aq) + 2H+(aq) + 2e− If the original oxidation number of the metal ion for the metallic salt is +3, what is the new oxidation number of the metal ion? A +1 B +2 C +4 D +5 3 A carbon -containing macromolecule contains a large amount of carbon, mainly of isotopes 12C and 13C. It was found that the relative atomic mass of carbon in the molecule is 12.2. What is the ratio of 12C to 13C in the molecule? A 3:1 B 4:1 C 3:4 D 1:4 4 Use of the Data Booklet is relevant to this question. What does the ion 31P3– have in common with an 40Ar atom? A They have isoelectronic structures. B Both have more neutrons than electrons. C The electronic configuration of their valence electron shell is 2s2 2p6. D Both particles are deflected to the same extent when passed through an electric field with the same strength.

3 [Turn over 5 Elements X and Y have successive ionisation energies as shown: ionisation energies / kJ mol‒1 1st 2nd 3rd 4th 5th 6th 7th X 787 1577 3232 4356 16091 19805 23780 Y 1310 3400 5300 7500 11000 13300 20300 What could be the formula of the compound of these two elements? A X2Y3 B X3Y2 C XY D XY2 6 What is the electronic configuration of an element with its first ionisation energy higher than each of the elements before and after it in the Periodic Table? A 1s22s22p2 B 1s22s22p3 C 1s22s22p4 D 1s22s22p5 7 An element R has a giant molecular structure. Which statements are true of R? 1 It has strong covalent bonds between the molecules. 2 It has high melting point. 3 It is insoluble in water. 4 It can conduct electricity in the solid state. A 1 and 2 only B 1 and 4 only C 2 and 3 only D 3 and 4 only

4 8 In which pair of chemical species, is the bond angle of I smaller than that in II? I II A CO2 SF6 B NO3− SO2 C CO2 NO3− D SF6 NO3− 9 The following are two observations made of cyclohexane, C6H12: I Cyclohexane is often used as a solvent for many organic compounds. II Cyclohexane is immiscible in H2O. Which of the following statements explain either of the above observations? 1 The C−H bonds in cyclohexane are stronger than the O−H bonds in H2O. 2 There are strong instantaneous dipole – induced dipole interactions between C6H12 and the organic compounds. 3 The forces of interactions between C6H12 and H2O molecules are weaker than the hydrogen bonds in H2O. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 only 10 Which reaction is correctly represented with the stated type of standard enthalpy change of reaction? reaction equation type of enthalpy change A CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) standard enthalpy change of combustion B H2SO4(aq) + Ca(OH)2(aq) → CaSO4(s) + 2H2O(l) standard enthalpy change of neutralisation C C(s) + O2(g) → CO2(g) standard enthalpy change of reaction D ½N2(g) → N(g) bond energy

5 [Turn over 11 The lattice energies, cationic and anionic radii in KF and CaO are given as follows: lattice energy / kJ mol-1 ionic radius of cation / nm ionic radius of anion / nm KF -830 0.138 0.136 CaO -3530 0.099 0.140 Which statement best explains the difference in their lattice energies? A The forces of attraction between the ions in KF is stronger than that in CaO. B The inter-ionic distance in KF is larger than in CaO. C Both KF and CaO have the same total number of electrons in one mole of the compound. D KF has a higher degree of covalent character than CaO. 12 Use of the Data Booklet is relevant to this question. A student carried out an experiment to determine the enthalpy change of combustion of ethanol (Mr = 46.0). It was found that the combustion of 1.00 g of ethanol raises the temperature of 100 g of water by 43 °C. Given that the enthalpy change of combustion of ethanol is −1370 kJ mol−1, what is the percentage efficiency of the heat transfer process? A 97% B 81% C 60% D 46%

6 13 The Maxwell -Boltzmann Energy distribution graph shows the number of molecules having a particular kinetic energy at constant temperature. Which statement is correct? A As temperature decreases, the total area under the curve remains the same. B At a higher temperature, area N decreases. C At lower temperature, the proportion of molecules in L and M increases and Ea becomes higher. D As temperature increases, the maximum point Q shifts to the left. 14 Platinum is a material used as a catalyst in a catalytic converter. It is used in the form of nanoparticles. These nanoparticles can exhibit enhanced chemical reactivity, making them useful in catalysis and other chemical processes. Which statement about the platinum catalyst is correct? A Less sites are available for catalysis to occur in spherical nanoparticles with a smaller diameter. B Nanoparticles of platinum are used since they have a large surface area to volume ratio. C Platinum nanoparticles react with nitrogen oxide to form nitrogen and platinum oxide. D The platinum catalyst helps to remove pollutants such as carbon dioxide gas from the exhaust. Q

7 [Turn over 15 Hydrogen peroxide reacts with acidified iodide ions and produces iodine according to the equation shown. H2O2(aq) + 2H+(aq) + 2I–(aq) → 2H2O(l) + I2(aq) The following results were obtained. initial concentrations of reactants / mol dm–3 initial rate of formation of I2 / mol dm–3 s–1 Experiment [H2O2] [I−] [H+] 1 0.010 0.010 0.10 2.0 × 10−6 2 0.030 0.010 0.10 6.0 × 10−6 3 0.030 0.020 0.10 1.2 × 10−5 4 0.030 0.020 0.20 1.2 × 10−5 5 0.020 0.020 0.020 unknown What is the initial rate of formation of I2, in mol dm−3 s−1 for Experiment 5? A 6.4 × 10−11 B 3.2 × 10−9 C 1.6 × 10−7 D 8.0 × 10−6 16 Which statement about the reversible reaction, S ⇌ T, is correct when the syst