ACJC_H1_CHEM_MCQ

ANGLO-CHINESE JUNIOR COLLEGE DEPARTMENT OF CHEMISTRY Preliminary Examination CHEMISTRY 8872/01 Higher 1 Paper 1 Multiple Choice 24 August 2017 50 minutes 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 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 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 16 printed pages. 8872/01/Prelim/17 ANGLO-CHINESE JUNIOR COLLEGE © ACJC 2017 Department of Chemistry [Turn over

2 © ACJC 2017 8872/01/Prelims/17 [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 Ether has the formula, CH3OCH3. In a sample of ether, 8.7 % contains the 18O isotope, with the rest contains the 16O isotope. What is the relative molecular mass of ether in this sample? A 46.2 B 46.8 C 47.2 D 47.8 2 Copper reacts with dilute nitric acid to produce nitrogen dioxide gas. The balanced ionic equation is given. Cu + 2H + + 2HNO3  Cu2+ + 2NO2 + 2H2O Which of the following is correct? Oxidation state of N in Role of copper HNO 3 NO 2 A +5 -3 Reducing agent B +5 +4 Reducing agent C -5 -3 Oxidising agent D -5 +4 Oxidising agent

3 © ACJC 2017 8872/01/Prelims/17 [Turn over 3 10 cm 3 of propane was completely burnt in x cm3 of excess oxygen. After cooling to room temperature, the volume of the residual gas was 60 cm 3. The residual gas was passed through aqueous sodium hydroxide was passed through and the volume reduced to y cm3. Which of the following is correct? x y A 50 30 B 60 20 C 70 20 D 80 30 4 An organic compound with the formula C xHyO2 has undergone incomplete combustion, producing carbon dioxide and carbon monoxide in the ratio of 99 : 1. The equation may be represented as follows: CxHyO2 + a O2  b CO + c CO2 + 0.5y H2O a, b and c can be expressed in terms of x and y. Which of the following is correct? a b c A 99x + 0.5x + 0.25y - 1 x 99x B 99x + 0.5x + 0.25y x 99x C 0.9