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ISC Class XII Board Exam 2020 : Chemistry Paper 1 (Theory)

7 pages, 74 questions, 7 questions with responses, 7 total responses,

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

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CHEMISTRY PAPER 1 (THEORY) (Maximum marks: 70) (Time allowed: Three hours) (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time.) --------------------------------------------------------------------------------------------------------------------All questions are compulsory Question 1 is of 20 marks having four sub parts, all of which are compulsory. Question numbers 2 to 8 carry 2 marks each, with two questions having internal choice. Question numbers 9 to 15 carry 3 marks each, with two questions having an internal choice. Question numbers 16 to 18 carry 5 marks each, with an internal choice. 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 Faraday = 96500 coulombs. Avogadro s number = 6 023 1023. --------------------------------------------------------------------------------------------------------------------- Question 1 (a) Fill in the blanks by choosing the appropriate word/words from those given in the [4 1] brackets: (iodoform, volume, mass, haloform, gram equivalent, chloroform, carbylamine, sp3d2, high, coke, d2sp3, low, gram mole, carbon monoxide) (i) Equivalent conductivity is the conducting power of all the ions furnished by one ___________ of an electrolyte present in a definite ________ of the solution. (ii) Bleaching powder, on treatment with ethanol or acetone gives _______. This is an example of _________ reaction. (iii) Outer orbital complexes involve ________ hybridization and are _______ spin complexes. (iv) Zinc oxide is reduced by _________ at 1673K to form zinc and __________. --------------------------------------------------------------------------------------------------------------------This Paper consists of 7 printed pages and 1 blank page. 1220-862A Turn over Copyright reserved.

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