2019 SAJC H2 Chem Prelim P1 QP

1 NAME Class ST ANDREW’S JUNIOR COLLEGE JC2 Preliminary Examination H2 Chemistry (9729) Paper 1 Multiple Choice 19 Sep 2019 1 hour Additional Materials: Multiple Choice Answer Sheet, Data Booklet READ THESE INSTRUCTIONS: Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. 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. 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 14 printed pages (including this page).

2 1 Which statement about one mole of sodium metal is always true? A It has the same mass as one mole of 12C. B It has the same number of atoms as 18 g of water. C It has the same number of atoms as 1 12 mole of 12C. D It has the same number of atoms as 12 dm3 of fluorine gas at r.t.p. 2 0.84 g of an oxide MO of a metal M was dissolved in excess sulfuric acid. 25.0 cm 3 of 0.12 mol dm3 potassium manganate(VII) solution was required to oxidise M2+ to M3+. What is the relative atomic mass of M? A 36.0 B 40.0 C 52.0 D 56.0 3 X and Y are elements found in the first three periods of the Periodic Table. The outermost shell electronic configurations of two species are given as follows: X2: Y2+: What can best be deduced from the above information? A X has a larger proton number than Y. B X has more unpaired electrons than Y at the ground state. C X exists as a gas while Y is a solid at standard condition. D X2 and Y2+ are isoelectronic.

3 4 In an experiment, a sample of gaseous 87Sr2+ was passed through an electric field. The angle of deflection for 87Sr2+ was observed to be 2. The experiment was repeated with gaseous sample of particle Q. Which of following could be Q? A 74As3 B 19F C 79Se2 D 127Te2 5 BeCl2 reacts with CH3NH2 to form compound Z (Mr = 142.0). Which of the following statements are correct? 1 The hybridisation state of N in Z is sp3. 2 Hydrogen bonds exist between molecules of compound Z. 3 1 mol of compound Z is formed from 1 mol of BeCl2 and 2 mol of CH3NH2. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 3 only 6 Which of the following graphs correctly describes the variation of pV with temperature for a fixed amount of an ideal gas? pV / Pa m3 T / oC A B C D 87Sr2+ ─ + Particle Q 0

4 7 The conversion of graphite into diamond is an endothermic reaction. C(graphite)  C(diamond) Which of the following statements are correct? 1 The carbon-carbon bonds in graphite are strong