2013_MI_H1_Chemistry_P1

Class Adm No Candidate Name: This question paper consists of 12 printed pages and 2 blank pages. [Turn over 2013 Promotional Examination II Pre-University 2 H1 CHEMISTRY 8872 / 01 24 September 2013 50 minutes Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST INSTRUCTIONS TO CANDIDATES 1. Do not turn over this question paper until you are told to do so. 2. Write your name, class and admission number in the spaces provided at the top of this page and on the Answer Sheet provided. 3. Answer ALL questions and shade the correct answers on the Answer Sheet provided using a soft pencil. 4. No extra time will be given for shading. 5. Hand in the question paper and the Answer Sheet separately. INFORMATION FOR CANDIDATES Marks will not be deducted for wrong answers; your total score will be the number of correct answers given. FOR EXAMINER’S USE TOTAL (30 marks)

2 Answer all questions on the OMR form provided (30 Marks) Section A For each question, there are four possible answers, A, B, C and D. Choose the one you consider correct. 1. Which of the following have the same number of particles as 32.0 g of oxygen gas? A 2.0 g of hydrogen gas B 11.5 g of sodium metal C 24.0 g of carbon D 35.5 g of chlorine gas 2. 10 cm3 of a hydrocarbon C xHy was exploded with 100 cm 3 of oxygen. After cooling to room temperature, the resultant gaseous mixture has a volume of 80 cm 3. When the resultant gaseous mixture was treated with a solution of potassium hydroxide, the volume of the gaseous mixture decreased to 40 cm 3. What is the molecular formula of the hydrocarbon? [All gas volumes are measured at r.t.p.] A C 3H6 B C3H8 C C4H8 D C4H10 3. The metallic ion, Mx+, is oxidised to MO4 - by acidified K2Cr2O7 solution. A sample of 25.0 cm3 of 0.280 mol dm-3 aqueous Mx+ requires 23.30 cm3 of 0.200 mol dm-3 acidified K2Cr2O7 solution for complete reaction. What is the value of x in Mx+? [Cr2O7 2- + 14H+ + 6e¯ 2Cr3+ + 7H2O] A 1 B 2 C 3 D 4

[Turn over 3 4. Which of the following species in their ground states have three unpaired electrons? A Si B S C Fe3+ D Cr3+ 5. Which of the following species contains ionic, covalent and dative bonding within itself? A Al 2Cl6 B NH4SO4 C H2SO4 D H3O+ 6. Which of the following series of substances does not show a decreasing trend in boiling point? A BaCl2 > BCl3 > BF3 B CH3I > CH3Br > CH3Cl C AsH3 > PH3 > NH3 D CH3COONa > CH3COOH > CH3CH2OH 7. Which of the following reactions has a negative enthalpy change of reaction? A KOH(aq) + HCl(aq) → KCl(aq) + H 2O(l) B H2O(l) → H2O(g) C NaF(s) → Na+(g) + F (g) D Cl2(g)  2Cl(g)

4 8. Dinitrogen oxide, N=N=O, reacts with ethyne, H-C ≡C-H, in the gaseous phase to produce water vapour, carbon dioxide and nitrogen gases