VJC H2 Chem 2012 Prelim P1 QP (off centre)

 VJC 2012 9647/01/PRELIM/12 VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your NRIC/FIN number, name and CT group on There are forty questions. Answer A, B, C and D. Choose the one you consider correct and record your choices in Answer Sheet. Read the instructions on the Answer Sheet very care 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. This document consists of VJC 2012 9647/01/PRELIM/12 VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATIONS Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not use staples, paper clips, highlighters, glue or correction fluid. number, name and CT group on the Answer Sheet. Answer all questions. For each question there are four possible answers you consider correct and record your choices in soft pencil 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. This document consists of 20 printed pages. [Turn over 9647/0 19 September 2012 1 hour For each question there are four possible answers soft pencil on the separate Each correct answer will score one mark. A mark will not be deducted for a wrong answer.

2  VJC 2012 9647/01/PRELIM/12 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 hardness present in a water sample due to dissolved calcium ions can be determined by using an ion-exchange column as shown in the diagram. A 50 cm 3 sample of a solution containing calcium sul fate was passed through the ion-exchange resin. The calcium ions in the sample were quantitatively exchanged by hydrogen ions. The sample collected in the flask required 25 cm3 of 1.0 x 10-2 mol dm potassium hydroxide for complete neutralisation. What was the concentration of the calcium sulfate in the original sample? A 2.5 x 103 mol dm3 B 1.0 x 102 mol dm3 C 2.0 x 102 mol dm3 D 4.0 x 102 mol dm3 2 The bombardment of polonium atoms, Po, with atoms of an isotope of a Group element, X, may bring about a new element with proton number 11 5 via the following reaction. Po + X  [new element] + 5 neutrons What is the identity of X? A thallium B indium C gallium D aluminium 209 84

3  VJC 2012 9647/01/PRELIM/12 [Turn over 3 The successive ionisation energies (IE) of two elements, Q and R, are given below. IE / kJ mol−1 1st 2nd 3rd 4th 5th 6th 7th 8th Q 1090 2350 4610 6220 37800 47000 - - R 1251 2298 3822 5158 6542 9362 11018 33604 What is the likely formula of the compound that is formed when Q reacts with R? A QR B Q2R3 C QR4 D Q4R 4 The diagrams P, Q, R and S show how a change