SAJC Prelim P1_QNS_STUDENT

1 [Turn Over ST ANDREW’S JUNIOR COLLEGE JC2 Preliminary Examinations Chemistry Higher 2 9647/01 Paper 1 Multiple Choice 17th September 2015 1 hour Additional Materials: Multiple Choice Answer Sheet, Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. There are 40 questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Ch oose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Each correct answer will score one mar k. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. This document consists of 25 printed pages including this page.

2 [Turn Over Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 The mass percentage of magnesium in a mixture of magnesium chloride (Mr = 95.3) and magnesium nitrate (Mr = 148.3) was found to be 21.25%. What mass of magnesium chloride is present in 323 g of the mixture? A 151 g B 165 g C 172 g D 181 g 2 Which conversion results in a loss of electrons for the underlined species? A NO3 − to NO2 B NO2 − to NO3 − C S2O8 2− to SO4 2− D S4O6 2− to S2O3 2− 3 Which of the following pairs shows Gas Y deviating more from ideal gas behaviour than Gas X at the same temperature and pressure? Gas X Gas Y A HF HCl B H2O H2 C I2 Br2 D O2 NO2

3 [Turn Over 4 Use of the Data Booklet is relevant to this question. Which of the following shows the correct increasing trend for the angle of deflection when placed in an electric field? A Cl − < Ru3+ < Zn2+ B Ru3+ < Cl − < Zn2+ C Cl − < Zn2+ < Ru3+ D Zn2+ < Ru3+ < Cl − 5 Which of the following cannot form dimers? A CH3COOH B CH3CHO C AlCl3 D NO2 6 Which of the following species is planar and does not have dative bonding? A PO4 3− B SO4 2− C CO3 2− D NO3 −

4 [Turn Over 7 The behavior of Group II sulfates and hydroxides show different trends down the group. Group II sulfates become less soluble down the group, while Group II hydroxides become more soluble down the group. Which of the following statements helps to explain this trend? A Down the group, the magnitude of the lattice energy of Group II hydroxides has a more significant decrease than the magnitude of the sum of hydration energies of the ions. B Down the group, the magnitude of the lattice energy of Group II sulfates has a more significant decrease than the magnitude of the sum of hydration energies of the ions. C The hydration energy of the sulfate anion is larger in magnitude than the hydroxid e anion. D