MJC H2 Chem 2013 Prelim P1 QP _ Soln

©chemistry@meridian jc Name ________________________ Class: ___________ Reg Number: _____ MERIDIAN JUNIOR COLLEGE JC 2 Preliminary Examination (ANSWERS ON THE LAST PAGE) Higher 2 _________________________________________________________________________ Chemistry 9647 Paper 1 Multiple Choice 26 September 2013 1 hour Additional Materials: OMR Sheet Data Booklet ___________________________________________________________________ INSTRUCTIONS TO CANDIDATES Write your name, class and register number in the spaces provided at the top of this page. There are forty questions in this section. Answer all questions. For each question, there are four possible answers labelled A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the OMR answer sheet. Read very carefully the instructions on the use of OMR answer sheet. You are advised to fill in the OMR Answer Sheet as you go along; no additional time will be given for the transfer of answers once the examination has ended. This document consists of 24 printed pages and 1 blank page. Use of OMR Answer Sheet Ensure you have written your name, class register number an d class on the OMR Answer Sheet. Use a 2B pencil to shade your answers on the OMR sheet; erase any mistake cleanly. Multiple shaded answers to a question will not be accepted. For shading of class register number on the OMR sheet, please follow the given examples: If your register number is 1, then shade 01 in the index number column. If your register number is 21, then shade 21 in the index number column.   865

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 polyoxometallate W 72Mn12Si7O268 40- was recently ident ified in a crystal garden. Which row gives oxidation states of tungsten and manganese that are consistent with this formula? oxidation state of tungsten oxidation state of manganese A +3 +2 B +3 +3 C +6 +2 D +6 +3 2 During the 1950s, a Sydney woman killed three family members and a friend by putting rat poison into the food and drinks she gave them. The crystalline toxic white compound, thallium sulfate, Tl2SO4, is water soluble. A single dose of more than 500 mg is fatal. At what minimum concentration of thallium sulfate does a 200 cm 3 cup of tea provide a fatal amount of the poison? A 0.990 x 10 -3 mol dm-3 B 1.66 x 10 -3 mol dm-3 C 4.96 x 10 -3 mol dm-3 D 8.32 x 10 -3 mol dm-3 3 Which compound is composed of a cation and anion(s) that do not contain the same number of electrons as each other? A LiH B NaOH C NH 4F D TiC l3 866

2 ©chemistry@meridian jc [Turn over 4 Which transition metal ion in the following species has only one unpaired electron in its d orbitals? A [CoC l4]2- B [Fe(H 2O)5(F)]2+ C [Mn(CN) 6]3- D [VO(H