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ISC Board Specimen 2011 : Chemistry Paper 1 (Theory)

6 pages, 56 questions, 56 questions with responses, 159 total responses,

ISC 12th
Indian School Certificate Examination (ISC), New Delhi

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CHEMISTRY Paper 1 (THEORY) (Three Hours) (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time) -------------------------------------------------------------------------------------------------------------------------Answer all questions in Part I and six questions from Part II, choosing two questions from Section A, two from Section B and two from Section C. All working, including rough work, should be done on the same sheet as, and adjacent to, the rest of the answer. The intended marks for questions or parts of questions are given in brackets [ ]. Balanced equations must be given wherever possible and diagrams where they are helpful. When solving numerical problems, all essential working must be shown. In working out problems use the following data: Gas Constant R = 1.987 cal deg-1 mol-1 = 8.314 JK-1 mol-1 = 0.0821 dm3 atm K-1mol-1 1 l atm = 1 dm3 atm = 101.3 J. 1 Farday = 96500 Coulombs. ------------------------------------------------------------------------------------------------------------------------------PART I Answer all questions Question 1 (a) Fill in the blanks by choosing the appropriate word/words from those given in brackets: [5] (electron, proton, neutron, decreases, increasing, lowering, one, two, acidic, basic, anion, cation, paramagnetic, Lewis acid, Lewis base, carbonic acid, sulphurous acid, sulphuric acid, ammonium carbonate, sodium bicarbonate, six, increases) (i) A positive catalyst _______ the rate of a reaction by _____ the activation energy. (ii) Human blood is a buffer solution of _________ and _________. (iii) BF3 is a _________ since it is an _________ deficient molecule. (iv) Oxygen is ________ due to the presence of ______ unpaired electrons. (v) A solution of FeCl3 is ________ due to ________ hydrolysis. ------------------------------------------------------------------------------------------------------------------------------ISC Specimen Question Paper 26

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