2019 NJC Prelim P1 QP

[Turn over NATIONAL JUNIOR COLLEGE SH2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME SUBJECT CLASS REGISTRATION NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 9729/01 Thursday 19 September 2019 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, subject class and registration 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 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. A Data Booklet is provided. Instructions on how to fill in the Optical Mark Sheet Shade the index number in a 5 digit format on the optical mark sheet: 2nd digit and the last 4 digits of the Registration Number. Example: Student Examples of Registration No. Shade: 1805648 85648 This document consists of 12 printed pages.

2 NJC/H2 Chem Prelim/01/2019 1 When a sports medal with a total surface area of 150 cm 2 was evenly coated with silver by electrolysis, its mass increased by 0.216 g. How many atoms of silver were deposited per cm2 on the surface of the medal? A 8.0 × 1018 B 1.8 × 1019 C 1.2 × 1021 D 4.1 × 1022 2 Which species is deflected to the greatest extent in an electric field? A e− B H+ C He2+ D F− 3 In an experiment, 50.0 cm 3 of a 0.10 mol dm –3 solution of M3+ salt reacted exactly with 25.0 cm3 of 0.10 mol dm–3 aqueous sodium sulfite. The half-equation for oxidation of sulfite ion is shown below. SO32−(aq) + H2O(I) → SO42−(aq) + 2H+(aq) + 2e– What is the final oxidation number of M? A +1 B +2 C +4 D +5 4 The graph shows the first thirteen successive ionisation energies for element E. What can be deduced about element E from the graph? A It is in Period 3 of the Periodic Table. B It is a d−block element. C It is in Group 2 of the Periodic Table. D It is aluminium.

3 NJC/H2 Chem Prelim/01/2019 [Turn over 5 What is the order of increasing radii for the three species shown? smallest largest A Ar Ca2+ K+ B Ar K+ Ca2+ C Ca2+ K+ Ar D K+ Ar Ca2+ 6 Organic nitrates in photochemical smog can cause breathing difficulties. The diagram shows an example of an organic nitrate molecule. What is the order of increasing bond angles? A 1 < 2 < 3 B 2 < 1 < 3 C 3 < 1 < 2 D 3 < 2 < 1 7 Two glass vessels F and