RI_Prelim_CHEM_P1

-1- RAFFLES INSTITUTION (JUNIOR COLLEGE) PRELIMINARY EXAMINATION 2009 HIGHER 2 CHEMISTRY 9746/01 Paper 1 Multiple Choice 24 September 2009 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not open this question booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number in the spaces provided on the Answer Sheet. 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 to be correct and record your choice with a 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. This document consists of 16 printed pages.

-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 The following reaction is used in the titration of iron( II ) solution with acidified potassium dichromate( VI ). 6Fe 2+ + Cr 2O7 2– + 14H + → 6Fe 3+ + 2Cr 3+ + 7H 2O If 50.0 cm 3 of an iron( II ) solution require 45.20 cm 3 of 0.100 mol dm – 3 potassium dichromate( VI ) for reaction, what is the mass of Fe 2+ ions in 1 dm 3 of the iron( II ) solution? A 12.6 g B 25.2 g C 30.3 g D 60.5 g 2 Of the following, which is the strongest oxidising agent? A O 2 + B O 2 C O 2 – D O2 2– 3 Which of the following equations represents the th ird ionisation energy of titanium? A Ti(s) → Ti 3+ (g) + 3e – B 3Ti(g) → 3Ti +(g) + 3e – C Ti 2+ (g) → Ti 3+ (g) + e – D 3Ti 2+ (g) → 3Ti 3+ (g) + 3e – 4 Which form of orbital hybridisation can form molec ules or ions that are square pyramidal in shape? A sp 2 B sp 3 C sp 3d D sp 3d2 [Turn over

-3- 5 Which one of the following pairs does not contain two species with the same molecular shape? A SC l 2 and SO 2 B BC l3 and BrC l3 C BeF 2 and BrF 2 – D C lF4 + and PF 4 – 6 The standard enthalpy changes for three reactions are given below. C(s) + 2H 2(g) → CH 4(g) ∆ H/ring2 = x C(s) + O 2(g) → CO 2(g) ∆ H/ring2 = y H 2(g) + ½O 2(g) 