NYJC_Prelim_CHEM_P1

NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9746/01 Paper 1 Multiple Choice 25 September 2009 1 hour Additional Materials: Mult iple 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 16 printed pages and 0 blank page. [Turn over

2 Section A For each question there are four possible answers A, B, C and D. Choose the one you consider to be correct. 1 When 15 cm 3 of a gaseous hydrocarbon X were burned in 100 cm 3 of oxygen, the final gaseous mixture contained 60 cm 3 of carbon dioxide and 10 cm 3 of unreacted oxygen. [All gaseous volumes measured under identical conditions.] What is the formula of hydrocarbon X? A C3H6 B C4H10 C C4H8 D C3H8 2 Magnesium nitride is a yello w-green powder and it reacts with water according to the following equation : Mg 3N2 (s) + 6 H2O (l) → 2 NH3 (aq) + 3 Mg(OH)2 (s) If 20 g of water are mixed with an excess of powder and any solids are filtered away, what is the appr oximate volume (in cm 3) of 0.82 mol dm -3 of HCl that is required to neutralize the ammonia produced ? A 150 B 300 C 450 D 900 3 Which one of the species has less electrons than neutrons and less neutrons than protons ? Particles A- B2+ C3+ D3- Neutrons 18 17 16 16 Nucleons 37 34 33 31 A A - B B2+ C C3+ D D3- 4 Which one of the following corresponds to the configuration of the three electrons of the highest energy for one of the elements in Group III? A 1s 2 2s1 B 2s1 2p2 C 3p3 D 4s2 4p1 H2 Chemistry 9746/01/NYJC J2/09PX [Turn Over

3 5 Which of the following pairs have different types of bonding and structure? A BeCl2 AlCl3 B SiO2 SiC C NaF AlF3 D ScCl3 AlCl 3 6 Which of the following pairs does Species X have a larger bond angle than Species Y Species X Species Y A SO 2 PI 3 B SF6 XeF 4 C CH4 SiCl 4 D H2S NH 3 7 Pure nitrosyl chloride, NOCl gas was heated at 300 oC in a 1.0 dm3 container. At equilibrium, the total pressure wa s 1.23 atm and the NOCl gas pressure was 0.810 atm. 2NOCl(g) 2NO(g) + CI2(g) What is the equilibrium constant, Kp at 300oC? A 0.00418 atm B 0.0167 atm C 0.0597 atm D 0.0915 atm H2 Chemistry 9746/01/NYJC