TJC H2 CHEM P1 QN Prelim

1 9647/01/TJC Prelim 2014 [Turn Over CHEMISTRY 9647/01 Paper 1 Multiple Choice Thursday 18th September 2014 1 hour Candidates answer on separate paper. Additional materials: Multiple 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, Civics Group and index number 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 your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct an swer 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 15 printed pages and 1 blank page

2 9647/01/TJC Prelim 2014 [Turn Over Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 In an experiment, 10 cm 3 of a solution containing a known concentration of iodate(V) ions, IO3 -, was run into an acidified solution containing an excess of iodide ions. IO3 - (aq) + 5I- (aq) + 6H+ (aq)  3H2O (l) + 3I2 (aq) The iodine liberated was found on titration to react with exactly 30 cm 3 of 0.1 mol dm -3 of sodium thiosulfate solution. What was the concentration of the iodate(V) ions? A 0.05 B 0.10 C 0.15 D 0.20 2 How will the volume of a 1.0 dm 3 sample of gas change when it is heated from 20 C to 80 C at constant pressure? A Increase to about 4.0 dm3 B Increase to about 1.2 dm3 C Decrease to about 0.5 dm3 D Decrease to about 0.2 dm3 3 An element shows oxidation states of +4 and +6 in forming compounds with both fluorine and oxygen. What is the most likely outer electronic configuration for the element? A 2s22p4 B 2s22p6 C 3s23p4 D 3s23p6

3 9647/01/TJC Prelim 2014 [Turn Over 4 Dilute sulfuric acid was added to aqueous barium hydroxide until the acid was in excess. Which graph shows the variation in the total number of ions in solution? A B C D 5 Aqueous acidified potassium mangan ate(VII) is used to oxidise iron(II) ethanedioate, FeC2O4, to Fe3+ and CO2. What is the concentration in mol dm -3 of 25 cm 3 aqueous acidified potassium manganate(VII) required to completely oxidise 0.05 mole of FeC2O4? A 0.4 B 0.8 C 1.2 D 3.33 6 In which set of species do the species all have the same shape? A BCl3, NH3, PCl3 B BeCl2, H2O, SO2 C CH4, NH4 +, SiF4 D CO2, H2O, SO2 7 Given that the ΔHθ f of H2O(l) is –285 kJ mol–1 and the ΔHθ f of CO2(g) is –394 kJ mol–1, what is the ratio of the heat generated by hydrogen gas to that of carbon if the same mass of each substance is burned? A 1:5 B 7:5 C 13:3 D 43:5 Number of ions Amount of acid added 0 Amount of acid added 0 Number of ions Amount of acid added 0 Amount of acid added 0 Number of ions Number of ions

4 9647/01/TJC Prelim 2014 [Turn Over 8 When iodine sublimes, 62.4 kJ mol–1 of heat enthalpy is required. What is the entropy change when 508 g of iodine sublimes at 80 C? A +177 J K–1 B +356 J K–1 C +707 J K–1 D +1560 J K–1 9 An evacuated vessel containing a small amount of powdered graphite is heated to 1080 K, and then CO 2 is added at a pressure of 0.458 atm. CO 2 reacts with graphite according to the following equation: CO2(g) + C(s) ⇌ 2 CO(g) After equilibrium has been reached, the total pressure inside the vessel is 0.757 atm. Calculate the equilibrium constant, Kp. A 0.25 B 2.25 C 3.76 D 14.1 10 Haber process involves the formation of ammonia gas from nitrogen and hydrogen gases. N2(g) + 3 H2(g) ⇌ 2 NH3(g) The value of equilibrium constant, Kp, is 3.56 x 10-7 at 1000 K. Which of the following statements is true? A Equilibrium constant increases when pressure is increased by reducing the volume. B Equilibrium constant increases when temperature of the system is increased. C Partial pressure of NH3 increases when temperature of the system is increased. D Number of moles of NH3 decreases when an inert gas is added at constant pressure. 11 Chlorophenol red is an acid–base indicator with a pH range of 4.8 to 6.4. The acidic colour of the indicator is yellow and the alkaline colour is red. Two drops of the indicator are added to each of the four aqueous solutions listed below. Which solution has its colour correctly stated? A Aqueous solution of MgCl2 yellow B Equal proportions of sodium ethanoate and ethanoic acid [pKa of ethanoic acid = 4.7] orange C 0.1 mol dm-3 of CH3COOH (Ka= 1.8 x 10-5 mol dm-3) orange D Aluminium oxide in aqueous solution red

5 9647/01/TJC Prelim 2014 [Turn Over 12 The pH of pure water is 6.85 at 35 oC. The pH of a saturated solution of a Group III hydroxide is 11.30 at the same temperature. What is the numerical value of the solubility product of this hydroxide at 35 oC? A 7.9 x 10–12 B 4.0 x 10–12 C 8.4 x 10–11 D 3.6 x 10–11 13 For the reaction 2X(aq) + Y(aq)  Z(aq) at room temperature, the rate equation is Rate = k [H+][X]2 Which of the following statements is not correct? A H+ is a catalyst in the reaction. B The reaction involves the formation of an intermediate. C When the concentration of Y is halved at 15°C, the rate decreases. D If the concentrations of H+ and X are doubled, the rate increases by six times. 14 When 0.10 mol of chloride of Period 3 element A is reacted with limited amount of water, white fumes are observed. Upon dissolving the white fumes in water, the resultant solution is found to react with 0.20 mol of aqueous sodium hydroxide. To which Group of the Periodic Table does A belong? A II B III C IV D V 15 A cobalt(III) compound has the formula of Co(H2O)6Cl3. 1 mole of this compound form s 2 moles of silver chloride precipitate when aqueous silver nitrate is added. What is the identity of this compound? A [Co(H2O)6]Cl3 B [Co(H2O)5Cl]Cl2.H2O C [Co(H2O)4Cl2]Cl.2H2O D [Co(H2O)3Cl3].3H2O

6 9647/01/TJC Prelim 2014 [Turn Over 16 Some complex ions show geometric isomerism, and have cis - and trans- forms, similar to alkenes. Which of the following species is likely to display cis-trans isomerism? Complex ion Shape A [Ag(NH3)2]+ linear B [Pt(NH3)2Cl2] square planar C [Zn(NH3)2Cl2] tetrahedral D [Fe(H2O)5SCN]2+ octahedral 17 Use of the Data Booklet is relevant to this question. Excess zinc was added to acidified potassium dichromate(VI) solution in a conical flask. Effervescence was observed until all the zinc had been fully reacted. The resulting solution was then left to stand for a long time. What is the final colour of the resulting solution? A Orange B Yellow C Green D Sky-blue 18 When a mixture of a white solids, X, is treated with an excess dilute hydrochloric acid, a