RVHS H2 Chem 2012 Prelim P1 QP

CANDIDATE NAME CLASS CENTRE NUMBER 1 RIVER VALLEY HIGH SCHOOL YEAR 6 PRELIMINARY EXAMINATION 6 S INDEX NUMBER H2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 21 September 2012 1 hour Additional Materials:Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class, centre number and index number on the Answer Sheet in the spaces provided. 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 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 document consists of 16 printed pages. River Valley High School 9647/01/PRELIM/12 [Turn over Prelim Examination 2012 Year 6 H2 Chemistry 9647 Paper 1

2 River Valley High School 9647/01/PRELIM/12 [Turn over Prelim Examination 2012 Year 6 H2 Chemistry 9647 Paper 1 S ection A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 Methane was burned with a faulty Bunsen burner. As a result, a mixture of carbon dioxide and carbon monoxide was produced in a ratio of 98:2, together with water vapour. What was the volume of oxygen gas used when y dm3 of methane was burned? A (2y - 0.01 2 y) dm3 B (2y -0.01y) dm3 C (y - 0.01 2 y) dm3 D (y -0.01y) dm3 2 An ion of metal M can be oxidised by potassium manganate( VII) in acid solution to form MO3−. In an experiment, 1.25 ´ 10−3 mol of the ion of M required 37.5 cm 3 of 0.0200 mol dm−3 potassium manganate(VII) for complete reaction. What is the initial oxidation state of the ion of M? A +1 B +2 C +3 D +4 3 Which of the following statements best explains why the boiling point of CH3CH2CH2NH2 is higher than that of (CH3)3N? A There are hydrogen bonds between CH 3CH2CH2NH2 molecules but no hydrogen bonds between (CH3)3N molecules. B The covalent bonds between atoms in CH 3CH2CH2NH2 are stronger than those between atoms in (CH3)3N. C CH3CH2CH2NH2 molecule has a larger surface area than (CH3)3N molecule. D CH3CH2CH2NH2 molecule is polar but (CH3)3N molecule is not.

3 River Valley High School 9647/01/PRELIM/12 [Turn over Prelim Examination 2012 Year 6 H2 Chemistry 9647 Paper 1 4 Which of the following electrostatic attraction is not present in a sample of CH3F? A permanent dipole-permanent dipole interactions B instantaneous dipole-induced dipole interactions C hydrogen bonds D covalent bonds 5 Which of the following graph is obtained when density ( ρ) is plotted against temperature (T) for an ideal gas under constant pressure? A B C D 6 Which of the following oxides is unlikely to dissolve in aqueous sodium hydroxide? A MgO B A l2O3 C SiO2 D SO2 ρ T / °C ρ T / °C ρ T / °C ρ T / °C 0 0 0 0

4 River Valley High School 9647/01/PRELIM/12 [Turn over Prelim Examination 2012 Year 6 H2 Chemistry 9647 Paper 1 7 Nitrogen dioxide decomposes on heating according to the following equation. 2NO2(g) ⇌ 2NO(g) + O2(g) When 2 mol of nitrogen dioxide is placed in a 4 dm 3 container and heated, the equilibrium mixture contained 0.8 mol of oxygen. What is the numerical value of the equilibrium constant, Kc, at the temperature of the experiment? A 0.0889 B 0.800 C 3.20 D 12.8 8 Which statement about the effect of a catalyst on a reversible reaction is correct? A It increases the yield of product in an equilibrium. B It increases the equilibrium constant for the forward reaction. C It increases the rate of the forward reaction and decreases the rate of the reverse reaction. D It increases the rate constant for both the forward and the reverse reaction. 9 Which expression represents the solubility product of iron(III) hydroxide? A [Fe3+][OH−] B [Fe3+][OH−]3 C [Fe3+][3OH−] D [Fe3+][3OH−]3

5 River Valley High School 9647/01/PRELIM/12 [Turn over Prelim Examination 2012 Year 6 H2 Chemistry 9647 Paper 1 10 H2SO4(aq) was added to Ba(OH)2(aq) until the acid was in excess. Which graph shows the variation in the total number of ions in solution? A B C D 11 The product of the concentrations of X and Y, [X][Y], is plotted against time, t, for the following second-order reaction. X + Y ® Z Which graph would be obtained? A B C D No. of ions Vacid No. of ions Vacid No. of ions Vacid No. of ions Vacid [X][Y] t [X][Y] t [X][Y] t [X][Y] t 0 0 0 0 0 0 0 0

6 River Valley High School 9647/01/PRELIM/12 [Turn over Prelim Examination 2012 Year 6 H2 Chemistry 9647 Paper 1 12 Which one of the following elements has the same oxidation state in all of its known compounds? A beryllium B bromine C nitrogen D sulfur 13 X is obtained by reacting aqueous cobalt( III) c hloride with ammonia. The co- ordination number of cobalt is 6 and when the complex is treated with an excess of aqueous silver nitrate, only ⅓ of the total chloride is precipitated as AgCl. What is the formula of X? A Co(NH3)6Cl3 B Co(NH3)5Cl3 C Co(NH3)4Cl3 D Co(NH3)3Cl3 14 Using relevant E Ɵ values from the Data Booklet , determine which of the following statements is correct. A No reaction occurs when V3+(aq) is added to Fe3+(aq). B VO2+(aq) can reduce Fe2+(aq) to Fe3+(aq). C Zn2+(aq) can reduce VO2+(aq) to V3+(aq). D Zn(s) can reduce V3+(aq) to V2+(aq). 15 A current of 8 A is passed for 100 min through molten aluminium oxide using inert electrodes. What will be the approximate volume of gas liberated, measured at s.t.p.? A 2.8 dm3 B 3.0 dm3 C 11.2 dm3 D 12.0 dm3 16 Which one of the following products is not obtained commercially by the electrolysis of concentrated brine? A chlorine B oxygen C sodium chlorate(V) D sodium hydroxide

7 River Valley High School 9647/01/PRELIM/12 [Turn over Prelim Examination 2012 Year 6 H2 Chemistry 9647 Paper 1 17 Use of the Data Booklet is relevant to this question. In the construction of pacemakers for the heart, a tiny magnesium electrode can be used to create an electrical cell with the inhaled oxygen. The relevant half -equations are as shown: Mg2+ + 2e− ⇌ Mg ½ O2 + 2H+ + 2e− ⇌ H2O In the body, a potential of 3.20 V is usually obtained. What is the best explanation for this e.m.f.? A The small size of the magnesium electrode B The low concentration of Mg 2+ surrounding the magnesium electrode C The high resistance of the body fluids surrounding the electrodes D The physiological pH of between 7 and 8 of the body fluid surrounding the electrodes 18 Use of the Data Booklet is relevant to this question. The enthalpy changes for three reactions are given below: Na(s) ® Na(g) DH1 = +107 kJ mol−1 H+(aq) + OH−(aq) ® H2O(l) DH2 = −58 kJ mol−1 2Na+(g) + 2H+(aq) + 2e− ® 2Na+(aq) + H2(g) DH3 = −1700 kJ mol−1 What is the enthalpy change for the following reaction? Na(s) + H2O(l) ® Na+(aq) + OH−(aq) + ½H2(g) A −191 kJ mol−1 B −307 kJ mol−1 C −685 kJ mol−1 D −1041 kJ mol−1 19 The bond dissociation energy of H−C l is 431 kJ mol −1. In which of the following processes is 431 kJ of energy released? A HCl(g) ® H(g) + Cl(g) B H(g) + Cl(g) ® HCl(g) C HCl(g) ® ½H2(g) + ½Cl2(g) D ½H2(g) + ½Cl2(g) ® HCl(g)

8 River Valley High School 9647/01/PRELIM/12 [Turn over Prelim Examination 2012 Year 6 H2 Chemistry 9647 Paper 1 20 Vitamin E acts as an antioxidant as well as an enzymatic activity regulator. There are 8 forms of Vitamin E, of which a -tocopher