AJC H2 Chem 2012 Prelim P1 QP

ANDERSON JUNIOR COLLEGE Preliminary Examinations 2012 CHEMISTRY 9647/01 Higher 2 19 September 2012 Paper 1 Multiple Choice 1 hour 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. 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 Multiple Choice Answer Sheet. 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. Multiple Choice Answer Sheet Write your name, PDG and NRIC/FIN number, including the reference letter. Shade the NRIC / FIN number. Exam Title: JC 2 Prelim Exam Details: H2 Chem / Paper 1 Date: 19/09/2012 This document consists of 17 printed pages. AJC Prelim 2012 9647/01/H2 [Turn over

2 AJC Prelim 2012 9647/01/H2 Section A For each question there are four possible answers, A , B, C and D. Choose the one you consider to be correct. 1 The first stage in the manufacture of nitric acid is the oxidation of ammonia by oxygen. aNH3(g) + bO2(g) cNO(g) + dH2O(g) What are the values for a, b, c and d? a b c d A 4 5 4 6 B 4 6 4 5 C 5 6 5 4 D 6 5 6 4 2 The nickel–cadmium rechargeable battery is based on the following overall reaction. Cd + 2NiOOH + 4H2O Cd(OH)2 + 2Ni(OH)2.H2O What is the oxidation number of nickel at the beginning and at the end of the reaction? Beginning End A +1.5 +2 B +2 +3 C +3 +2 D +3 +4 3 Which element has an equal numbe r of paired and unpaired electrons in its orbitals with principal quantum number 2? A Beryllium B Carbon C Nitrogen D Oxygen

3 AJC Prelim 2012 9647/01/H2 [Turn over 4 Americium–241 is commonly used in smoke detectors. It works by emitting a constant stream of alpha particles which are similar to the nucleus of 4He. Strontium–90 is another radioactive substance which can be used as a tracer for medicinal or agriculture uses. On decaying, it emits beta particles which can be considered as electrons. A small a mount of Americium –241 and Strontium –90 are separately placed in an ionisation chamber to emit a constant stream of radiation and the emitted particles are passed through an electric field. What would be the path of the emitted particles in an electric field? Americium–241 (a–particles) Strontium–90 (b–particles) A 1 2 B 1 3 C 4 1 D 3 1 5 Which of the following is not a feature in the corresponding ion? Ion Feature A HF2– Hydrogen bond B NO2– Unpaired electron C CO32– Delocalised electrons D C6H5O– All bond angles are 120° 1 2 3 4 + –

4 AJC Prelim 2012 9647/01/H2 6 Two gas bulbs, E and F, are connected by a stopcock. Bulb E contains argon a