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