RVHS Prelim_H1_Chemistry_P1_QP

River Valley High School 8873/01/PRELIMS/25 2025 JC2 Preliminary Examination [Turn over RIVER VALLEY HIGH SCHOOL JC 2 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 2 4 J CENTRE NUMBER S INDEX NUMBER H1 CHEMISTRY 8873/01 Paper 1 Multiple Choice 25 September 2025 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, class , centre number and index number on the Answer Sheet in the spaces 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 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. This document consists of 12 printed pages.

2 River Valley High School 8873/01/PRELIMS/25 2025 Preliminary Examination 1 Which of the species in their gaseous state shown below will be deflected by the largest angle in an electric field? A 11B3+ B 9Be2+ C 1H2 D 4He2+ 2 What is the electronic configuration of an element with a second ionisation energy higher than that of each of the elements on either side of it in the Periodic Table? A 1s22s22p63s2 B 1s22s22p63s23p1 C 1s22s22p63s23p2 D 1s22s22p63s23p3 3 Use of the Data Booklet is relevant to this question. High concentrations of ozone, O3, in the atmosphere at sea-level are dangerous. An acceptable concentration of O3 is 8.00 × 10−9 g cm−3. How many molecules of ozone would be present in 1 cm 3 of air at this concentration of O3? [L = Avogadro constant] A 98.00 10 48 L−   C 98.00 10 48 L − B 98.00 10 48 L −  D 98.00 10 48 L− 4 When 20 cm 3 of a gaseous organic compound w as completely burnt in 120 cm³ of oxygen, there was a contraction of 50 cm³. On further treatment with aqueous potassium hydroxide, the volume decreased by 60 cm³. Given that all volumes are measured at room temperature and pressure, what is the formula of the organic compound? A C2H2 B C2H4 C C3H6 D C3H8

3 River Valley High School 8873/01/PRELIMS/25 2025 Preliminary Examination [Turn over 5 Which equation shows a reaction in which one or more co -ordinate (dative covalent) bonds are formed? A N2 + 3H2 → 2NH3 B H2 + F2 → 2HF C Al2Cl6 → 2AlCl3 D NH3 + HCl → NH4Cl 6 Use of the Data Booklet is relevant to this question. Why is the boiling point of hydrogen sulfide greater than that of fluorine? A A molecule of hydrogen sulfide has more electrons than a molecule of fluorine. B Molecules of hyd