NJC_H2_CHEM_P1_Question_Paper Prelim

1 NJC Preliminary Examination 9647/01/14 [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 9647/01 Thu 18 Sep 2014 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, 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 40 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. This paper consists of 18 printed pages.

2 NJC Preliminary Examination 9647/01/14 Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Tin(IV) iodide can be prepared by refluxing 0.04 moles of tin with 0.03 moles of iodine dissolved in 50 cm3 of tetratchloromethane (boiling point: 77 oC). Sn + 2I2  SnI4 Orange crystals of the product are obtained by filtering the hot reaction mixture and then cooling the filtrate. Which of the following would indicate that the reaction is complete? A The boiling point of the reaction mixture is 77 oC. B No tin remains in the reaction flask. C Crystallisation occurs in the boiling solvent. D No more purple vapour is observed in the reaction vessel. 2 When an excess of K I was added to 5.0 cm 3 of a 0.400 mol dm 3 solution of AO4 3, 8.00 cm 3 of 0.500 mol dm -3 of Na 2S2O3 is required to react completely with the iodine liberated. What is the final oxidation state of A? A 3 B +1 C +2 D +3 3 Which equation corresponds to the third ionisation energy of titanium (Ti)? A Ti(g)  Ti3+(g) + 3e B Ti2+(s)  Ti3+(g) + e C Ti2+(g)  Ti3+(g) + e D Ti3+(g) + e  Ti2+(g) 4 A 1.0 dm3 sample of gas is heated from 27 °C to 54 °C under constant pressure. What will be the new volume of the gas at 54 °C? A 0.5 dm 3 B 0.9 dm3 C 1.1 dm3 D 2.0 dm3

3 NJC Preliminary Examination 9647/01/14 [Turn Over 5 The following graphs show the ideal gas relationship for 2 different ideal gases. Gas P has twice the amount of particles as gas Q. Which graph is correct? A B C D T p