H1 Paper 1 (Student Copy)

ANGLO-CHINESE JUNIOR COLLEGE DEPARTMENT OF CHEMISTRY Preliminary Examination CHEMISTRY 8872/01 Higher 1 Paper 1 Multiple Choice 12 September 2012 50 minutes Additional Materials: Multiple Choice Answer Sh eet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluids. Write your name, index number and tutorial class on the Answer Sheet in the spaces provided unless this has been done for you. 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 separate Answer Sheet. Read the instructions on the Answer Sheet very care fully. Each correct answer will score one mark. A mark wi ll not be deducted for a wrong answer. Any rough working should be done in this booklet. This document consists of 11 printed pages. 8872/Prelims/12 ANGLO-CHINESE JUNIOR COLLEGE © ACJC 2012 Department of Chemistry [Turn over

© ACJC 2007 9746/01/Prelim/07 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 Which of the following contains 1.60 × 10 22 of atoms? A 7.98 g of ethane B 1.86 g of chlorine free radicals (•C l) C 638 cm 3 of neon at 298 K and 1 atm D 5.95 dm 3 of hydrogen gas at 273 K and 1 atm 2 In an experiment, 20 cm 3 of a gaseous hydrocarbon C xHy, was completely burnt in 150 cm 3 of excess oxygen. The gaseous volume after the reaction was 120 cm 3 and treatment with aqueous potassium hydroxide dec reased the volume to 80 cm 3. All volumes were measured under room temperature and pressure. What is the molecular formula of the hydrocarbon? A C2H4 C C 4H8 B C2H6 D C 4H10 3 Iron poisoning in children is usually caused by exc essive intake of iron supplement pills. The amount of iron which will ca use poisoning depends on the size of the child. It was found that as little as 590 mg of Fe 2+ can be fatal to a 12 kg child. How many 325 mg FeSO 4 pills would it take to cause a fatal effect on a 1 2 kg child? A 3 C 5 B 4 D 6 4 In which of the following compounds does vananium h ave the lowest oxidation state? A VO 3 - C VO 2 + B VO 2+ D V 2O5

© ACJC 2007 9746/01/Prelim/07 [Turn over 3 5 In an experiment, 16.0 cm 3 of 0.3 mol dm -3 of acidified dichromate( VI ) ions was used to oxidise 28.8 cm 3 of 0.5 mol dm -3 of Gn+ . What is the change in oxidation number for element G? A -3 C +2 B -1 D +4 6 In 1996, Professor Hoffman and a group of scientist s discovered a new element known as Ununbium, Uub. An atom of Uub can be forme d by