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ICSE Class X Board Exam 2007 : Chemistry

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PART TEST-II_X_ICSE (ISO Certified Institute 9001 : 2008) 180 AJC Bose Road Kolkata 700014 033-40000460 / 9831818544 ------------------------------------------------------------------------------------------------------------------------------------------------------ CHEMISTRY SCIENCE Paper 2 (75 Minutes) [Total Mark : 50] --------------------------------------------------------------------------------------------------------Answers to this Paper must be written on the paper provided separately. Attempt all questions from Section I and any three questions from Section II. The intended marks for questions or parts of questions are given in brackets [ ]. --------------------------------------------------------------------------------------------------------SECTION I [20 Marks] Answer all questions from this Section Question 1: a) Choose the correct answer from the options given below: [1 5=5] i) If empirical formula of an organic compound is CH2O then its molecular formula can be a) C2H2O2 b) C2H4O c) C3H6O d) C6H12O6 ii) Which salt cannot be directly used as an electrolyte? iii) iv) a) AgNO3 b) Na [Ag (CN)2] c) Both of them d) None of these The process used to convert impure alumina to pure alumina is: a) Electrolytic refining b) Purification c) Baeyer s process d) Roasting followed by calcination Electrolysis of fused lead bromide is carried out in a) a glass container b) an aluminium container c) a clay crucible d) a silica crucible www.transitioncs.com Copyright reserved

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