RVHS Prelim P1_QP

1 River Valley High School 9729/01 [Turn over 2018 Preliminary Examinations RIVER VALLEY HIGH SCHOOL YEAR 6 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 6 CENTRE NUMBER S INDEX NUMBER H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 20 September 2018 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. Write your name, class and index number on the Optical Answer Sheet in the spaces provided. 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 Optical 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 12 printed pages.

2 River Valley High School 9729/01 [Turn over 2018 Preliminary Examinations For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 2 Sodium thiosulfate (Na 2S2O3) is used in the textile indu stry to remove an excess of chlorine from bleaching processes by reducing it to chloride ions. If 10 cm 3 of 0.20 mol dm −3 of sodium thiosu lfate requires 192 cm 3 of chlorine for complete reaction at r.t.p., which of the fo llowing is a possible fo rmula of the sulfur- containing product? A S B SO2 C HSO4− D H2S 3 Which of the following ions would undergo the smallest deflection in an electric field? A 16O2+ B 16O18O+ C 16O18O2+ D 18O2+ 4 The table below shows the fourth ionisation energies of five consecutive elements in the Periodic Table. Element V W X Y Z Fourth ionisation energy / kJ mol−1 10450 11710 4350 5030 4580 What is the formula of the bromide of V? A VBr B VBr2 C VBr3 D VBr5 1 A mixture of argon and another gas is commonl y used during welding. At s.t.p, the density of the gaseous mixture is 1.82 g dm−3. What is the identity of the other gas in the mixture? [Density of argon = 1.78 g dm−3 at s.t.p.] A neon B nitrogen C oxygen D carbon dioxide

3 River Valley High School 9729/01 [Turn over 2018 Preliminary Examinations 5 Two identical bulbs at the same temperature contain ideal gases P and Q separately. The density of gas P is half that of gas Q while the molecular mass of gas P is twice that of gas Q. What is the ratio of the pressure of gas P to that of gas Q? A 1 : 1 B 1 : 2 C 1 : 4 D 2 : 1 6 The auto-ionisation of bromine trifluoride is represented by the equation: 2BrF3 ⇌ BrF2+ + BrF4− Which of the following statements is correct? A BrF3 is planar while BrF4− is