1802f_PChem Rev MCQ - Raffles Junior College H2 Chemistry...

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Raffles Junior College H2 Chemistry 2008/2009 Physical Chemistry Revision Multiple Choice Questions Prepared by: Mr Tham Zi Sheng Time: 1 h 40 min Marks: ______/50 Name: ___________________________________ ( ) CT Group: __________ There are fifty questions. For each question, there are four possible answers, A , B , C , and D . Choose the one you consider to be correct. For those questions where there are three numbered statements 1 to 3 , the responses A to D should be selected on the basis of A B C D 1 , 2 and 3 are correct 1 and 2 only are correct 2 and 3 only are correct 1 only is correct 1 A hydrocarbon contains 85.7% carbon by mass. 10 cm 3 of the hydrocarbon was combusted completely in sufficient oxygen to produce water vapour and an acidic gas. At room temperature and pressure, the acidic gas required 16.65 cm 3 of 0.200 mol dm –3 NaOH(aq) for complete neutralisation. Which of the following is likely to be the density, in g dm –3 , of the hydrocarbon at room temperature and pressure? A 1.1 B 2.3 C 4.6 D 9.1 2 Copper ore, which contains copper(I) sulphide and copper(II) sulphide, is “roasted” according to the following equations: Cu 2 S + O 2 2Cu + SO 2 and CuS + O 2 Cu + SO 2 . When 50.0 g of the ore is “roasted”, 36.4 g of 87.2% pure copper are produced. If the ore contains 18.0% inert impurities, what is the percentage by mass of copper(II) sulphide in the ore? A 14.7% B 17.9% C 33.8% D 78.3% 3 60.0 cm 3 of dilute sulphuric acid and 40.0 cm 3 of ethanoic acid were mixed. A 25.0 cm 3 sample pipetted from the mixture was titrated with 0.200 mol dm –3 aqueous sodium hydroxide using a double-indicator method. The titration results are given below. Initial burette reading / cm 3 2.70 Burette reading at first end-point / cm 3 18.35 Burette reading at second end-point / cm 3 26.10 What were the concentrations of the acids before mixing? [H 2 SO 4 ] / mol dm –3 [CH 3 CO 2 H] / mol dm –3 A 0.104 0.155 B 0.104 0.334 C 0.209 0.334 D 0.209 0.468
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4 A 3.00 g sample of impure iron(II) oxide was dissolved completely in 50 cm 3 of 1.0 mol dm –3 sulphuric(VI) acid. 25.0 cm 3 of the resultant solution was found to require 23.30 cm 3 of 0.100 mol dm –3 aqueous potassium dichromate(VI) for complete reaction. Assuming that the impurities were inert, what is the percentage by mass of iron in this sample? A 8.7% B 26.0% C 52.0% D 66.9% 5 A sample of phosphorus is burned completely in chlorine gas to form phosphorus(III) chloride and phosphorus(V) chloride. Given that 2 amount of P used 5 amount of C used 9 l = , what is the value of 3 5 amount of PC formed amount of PC formed l l ? A 3 7 B 9 20 C 1 D 21 5 6 The successive ionisation energies, in kJ mol –1 , of an element Q are given below. 870
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1802f_PChem Rev MCQ - Raffles Junior College H2 Chemistry...

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