MI H2 Chem 2012 Prelim P1 QP

Class Adm No Candidate Name: This question paper consists of 16 printed pages. [Turn over] 2012 Preliminary Examination II Pre-university 3 H2 CHEMISTRY 9647 / 01 Paper 1 20 Sept 2012 1 hour Additional Materials: OMR 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 OMR provided. 3. Answer ALL questions and shade the correct answers on the OMR provided using a soft pencil. 4. No extra time will be given for shading. 5. Hand in the question paper and the OMR 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 (40 marks)

2 Answer all questions on the OMR form provided (40 Marks) For each question, there are four possible answers, A, B, C and D. Choose the one you consider correct. 1 Zn reacts with VO3 - ions to give Vn+. 3.9 g of Zn was required to react completely with 40.0 cm3 of 1.0 mol dm-3 of KVO3. What is the value of n? A 1 C 3 B 2 D 4 2 In which of the following pairs do the species have different shapes? A AlCl3 and CO3 2- B NH4 + and CH4 C NH3 and H 3O+ D SeF4 and SO4 2- 3 The following graph shows how ionic radius changes across Period 3 for seven elements. A The sharp increase in ionic radius between the 4th and 5th element is due to an increase in the number of principal quantum shells. B There is a decrease in ionic radius for the first 4 elements in Period 3 due to decreasing shielding effect. C There is a decrease in ionic radius for the last 3 elements due to decreasing proton to electron ratio. D The first 4 elements form anions and hence have lower ionic radii than the last 3 elements which form cations. 11 12 13 14 15 16 17 Atomic Number Unknown PropertyIonic radius

[Turn over 3 4 In which of the following reactions is the acid acting as an oxidant? A KBr + H3PO4  HBr + KH2PO4 B MgO + H2SO4  MgSO4 + H2O C 12HClO4 + P4O10  6Cl2O7 + 4H3PO4 D Cu + 4HNO3  Cu(NO3)2 + 2H2O + 2NO2 5 A 1 dm3 flask containing helium at 2 kPa pressure is connected (at constant temperature) to a 2 dm3 flask containing neon at 1 kPa pressure. What is the final pressure after connection? A ସ ଷ kPa B ଷ ଶ kPa C ହ ଷ kPa D 2 kPa 6 The use of the Data Booklet is relevant to this question. Phosphorus, P4, has the following molecular structure: Imagine that nitrogen were to form a similar molecule N4 shown in the reaction below: 2N2(g)  N4(g) What would be the value of ΔH (in kJ mol–1) for the above reaction? A 1028 B 1348 C 1954 D 2628

7 Which gas shows the greatest deviation from ideal gas behavior? A HCl B He C CH4 D N2 8 The use of the data booklet is relevant to this question. In many areas, tap water is slightly acidic due to dissolved will not be dissolved by tap water containing carbon dioxide? A Cr B Cu 9 Which of the following mixtures is