JC2 Chemistry H1 2017 Millenia QP

Class Adm No Candidate Name: This question paper consists of 12 printed pages and 2 blank pages. 2017 Preliminary Examination II Pre-University 2 H1 CHEMISTRY 8872/01 Paper 1 Multiple Choice 19th Sep 2017 50 minutes Additional materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not turn over this question paper until you are told to do so Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and admission number in the spaces provided at the top of this page and on the Multiple Choice Answer Sheet provided. There are thirty 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 Multiple Choice Answer Sheet provided. Read the instructions on the Multiple Choice 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 question paper. The use of an approved scientific calculator is expected, where appropriate. FOR EXAMINER’S USE TOTAL (30 marks)

2 Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 A sample of a rare ore containing iron and molybdenum was investigated. The composition of the sample is given in the table below. mass number 55 56 95 96 % abundance 5 54 36 5 What is the Ar of Fe in this sample of Elinvar? A 55.8 B 55.9 C 72.0 D 75.5 2 Perfluoroacetic acid is a structural analogue of ethanoic acid and is a stronger acid than ethanoic acid. The perce ntage composition by mass of per fluoroacetic acid is given as: C, 21.1%; H, 0.90%; O, 28.1%; F, 49.9%. What is the empirical formula of perfluoroacetic acid? A CHOF2 B C2H2OF C C2HO2F2 D C2HO2F3 3 Chalcopyrite is a common copper ore with the chemical formula CuFeS 2. Copper can be extracted from chalcopyrite through the roasting of the ore and undergoes the following reaction. 2CuFeS2(s) + 5O2(g) + 2SiO2 → 2Cu(l) + 4SO2(g) + 2FeSiO3(l) What is the mass of chalcopyrite needed to produce 10 g of Cu? A 28.9 B 51.6 C 57.8 D 103

3 [Turn over 4 Use of the Data Booklet is relevant to this question. Chloride ions can be oxidised to hypochlorous acid as shown below. Cl- + H2O ⇌ HClO + H+ + 2e- If 2 moles of acidified MnO 4- were reacted with 1 mol e of C l- ions, how many moles of hypochlorous acid would be obtained? A 1 B 2 C 5 D 10 5 What is the change in oxidation number of chlorine and manganese in the following reaction? 5ClO2- + 6H+ + 2MnO4- ⇌ 2Mn2+ + 5ClO3- + 3H2O Chlorine manganes