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ISC Class XI Prelims 2019 : Chemistry

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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: (Ketones, aldehydes, CaC2, cationic, acidic, Al4C3, anionic, alkaline, -I, -M, normality, molality, mole fraction, + I, +M, molarity, less, more) (i) _________and_________ are temperature independent mode of concentration representation. (ii) Trichloroacetic acid is _________ acidic than acetic acid due to _________ effect. (iii) Aqueous solution of NH4Cl will be _________ due to _________ hydrolysis. (iv) _________ on hydrolysis gives ethyne while _________ on hydrolysis gives methane. --------------------------------------------------------------------------------------------------------------------1 SPECIMEN QUESTION PAPER CLASS XI - 2019

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