2024 Prelims JPJC H2 Chem P1 (QP)

© Jurong Pioneer Junior College [Turn Over NAME CLASS 23S JURONG PIONEER JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION 2024 CHEMISTRY 9729/01 Higher 2 Paper 1 Multiple Choice Questions 16 September 2024 1 hour Candidates answer on the Question paper. 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 and exam index number on the Answer Sheet in the spaces provided unless this has been done for you. There are thirty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C or 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 © Jurong Pioneer Junior College 9729/01/J2 PRELIM EXAM/2024 [Turn Over 1 Which statement about relative atomic mass is correct? A It is the average of the masses of all the isotopes of that element. B It is the sum of the relative masses of the neutrons and protons in each atom. C It is the ratio of the average mass of one atom of an element to the mass of one 1H atom. D It is the ratio of the mass of one mole of atoms of an element to one-twelfth the mass of one mole of 12C atoms. 2 The ionisation energies, IE, in kJ mol-1, of five elements are given in the table. element 2nd ionisation energy / kJ mol-1 3rd ionisation energy / kJ mol-1 4th ionisation energy / kJ mol-1 F 3370 6040 8410 Ne 3950 6150 9290 Na 4560 6940 9540 Mg 1450 7740 10500 Al 1820 2740 11600 Which statement about these ionisation energies is correct? A The 2nd IE of F is greater than the 3rd IE of Al because Al2+ ions have more outer shell electrons than F+ ions. B The 3rd IE of all the elements in the table involves the removal of an electron from the same shell. C The 4th ionisation energy of Na is greater than the 3 rd IE of Ne because the nuclear charge of Na is greater than that of Ne. D The successive ionisation energies of these elements increase as these electrons are being taken from the same shell. 3 Why is the molecule of BCl3 planar, whereas the molecule of PH3 is pyramidal? A The boron atom has no d-orbitals available for bonding. B The covalent radius of chlorine is greater than that of hydrogen. C The repulsion between chlorine atoms is greater than that between hydrogen atoms. D The boron atom in BCl3 has six electrons in its valence shell, whereas the phosphorus atom in PH3 has eight.

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