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ISC Class XII Board Exam 2018 : Chemistry

8 pages, 74 questions, 1 questions with responses, 1 total responses,

Mohit Raj
City Montessori School (CMS Aliganj Campus I), Lucknow
XII PCM

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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 any two questions having internal choice. Question numbers 9 to 15 carry 3 marks each, with any 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: (square pyramidal, electrical, 74, 26, sp3d2, sp3d, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas) (i) A Galvanic cell converts _______ energy into ______ energy. (ii) The percentage of unoccupied spaces in bcc and fcc arrangements are _______ and ________ respectively. (iii) Propan-2-ol on reaction with iodine and sodium hydroxide gives ______ precipitate and the reaction is called ________test. (iv) The geometry of XeOF4 molecule is ________ and the hybridisation of xenon atom in the molecule is __________. --------------------------------------------------------------------------------------------------------------------This Paper consists of 8 printed pages. 1218-862A Turn over Copyright reserved.

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