NYJC_H2_CHEM_P1 Prelim

NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 27 September 2016 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. Write your name, class and tutor’s name on the Answer Sheet in the spaces provided unless this has been done for you. There are forty 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 you 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. This document consists of 20 printed pages and 0 blank page. [Turn over

2 H2 Chemistry 9647/01 NYJC J2/16 PX Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 In an experiment, lanthanum, 57La, was reacted with hydrogen to produce the non-stoichiometric ionic compound LaH 2.9. Assuming that the compound contains H, La2+ and La3+, what is the percentage of La3+ present in LaH2.9? A 10% B 20% C 80% D 90% 2 The two most common isotopes of titanium are Ti22 56 and Ti22 58 . Which statement about the isotopes of titanium is correct? A Both isotopes have more electrons than neutrons. B One of the isotopes has more protons than the other. C The electronic configuration of Ti2+ ion for both isotopes is the same. D In the same electric field strength, Ti22 56 will be deflected more than Ti22 58 . 3 Which compound does not have a co-ordinate bond? A CO B CS2 C NO3 D NH4+ 4 In which of the following pairs do the species have the same bond angle? A H2O2 and N2F2 B PH3 and SF3+ C POCl3 and SO32 D HCHO and BrF3

3 H2 Chemistry 9647/01 NYJC J2/16 PX [Turn over 5 Two glass vessels M and N are connected by a closed valve. M contains helium at 20 C at a pressure of 1 × 105 Pa. N has been evacuated, and has three times the volume of M. In an experiment, the valve is opened and the temperature of the whole apparatus is raised to 100 C. What is the final pressure in the system? A 3.18 × 104 Pa B 4.24 × 104 Pa C 1.25 × 105 Pa D 5.09 × 105 Pa 6 Which value would be required to estimate the lattice energy for the hypothetical ionic compound MgH? A the electronic affinity of hydrogen B the first ionisation energy of hydrogen C the magnesium–hydrogen bond energy D the standard enthalpy change of formation of MgH2 M N

4 H2 Chemistry 9647/01 NYJC J2/16 PX 7 A student performed an experiment to investigate a hypothetical reaction. 2A + B  C The graph of [A]