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ISC Class XII Board Exam 2019 : Chemistry

8 pages, 77 questions, 1 questions with responses, 1 total responses,

Mohit Raj
City Montessori School (CMS Aliganj Campus I), Lucknow
11-12 PCM with computer

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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: (more than, primary, cathode, Lucas reagent, two, four, less than, Grignard s reagent, tertiary, anode, zero, equal to, three) (i) The elevation of boiling point of 0 5 M K2SO4 solution is ___________that of 0 5 M urea solution. The elevation of boiling point of 0 5 M KCl solution is __________ that of 0 5 M K2SO4 solution. (ii) A mixture of conc. HCl and anhydrous ZnCl2 is called __________ which shows maximum reactivity with _________ alcohol. (iii) In electrolytic refining the impure metal is made __________ while a thin sheet of pure metal is used as _________. (iv) When the concentration of a reactant of first order reaction is doubled, the rate of reaction becomes _________ times, but for a __________ order reaction, the rate of reaction remains the same. --------------------------------------------------------------------------------------------------------------------This Paper consists of 8 printed pages. 1219-862A Turn over Copyright reserved.

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