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Class 12 ISC Board Exam 2018 : Chemistry Specimen Paper

6 pages, 78 questions, 53 questions with responses, 68 total responses,

Aiswarya Anil Nair
St. Thomas Residential School, Thiruvananthapuram

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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: (increases, decreases, efficient, same as, 68, non-efficient, greater than, 74, less than, sp3d3, sp3d2, octahedral, distorted octahedral, remains same) (i) Both ccp and hcp are ____________ close packing and occupy about _________% of the available space. (ii) The molar conductance of a solution _______________ with dilution, while its specific conductance _______________ with dilution. (iii) The geometry of XeF6 molecule is _____________ and the hybridization of Xe atom in the molecule is _______________. (iv) The acidic strength of phenol is ____________ ethyl alcohol but __________ nitro phenol. -------------------------------------------------------------------------------------------------------------------------1 ISC SPECIMEN QUESTION PAPER 2018

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