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ISC Class XI Board Specimen 2018 : Chemistry Paper 1

8 pages, 101 questions, 6 questions with responses, 8 total responses,    1    0
ISC 11th
Indian School Certificate Examination (ISC), New Delhi
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CHEMISTRY PAPER 1 (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 twenty marks having four sub parts all of which are compulsory. Question numbers 2 to 8 carry 2 marks with two questions having internal choice. Question numbers 9 to 15 carry 3 marks with two questions having internal choice. Question numbers 16 to 18 carry 5 marks each. Each question has an internal choice. The intended marks for questions or parts of questions are given in [ ] 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 the problems, use the following data: Gas constant R = 1.987 cal deg-1 mol-1 = 8.314 J K-1 mol-1 = 0.0821 L atm K-1 mol-1 1 L atm = 1 dm3atm = 101.3JAvogadro s number = 6.023 x 1023 --------------------------------------------------------------------------------------------------------------------- PART I Answer all questions. Question 1 (a) Fill in the blanks by choosing the appropriate word/words from those given in the brackets : [4x1] [methanal, propanone, weak, propanal , zero , more, dependent, + I , independent , -I , less, + M, ethanal, strong , -M ] (i) Molality is _______ of temperature, whereas, molarity is _______ of temperature. (ii) Chloroacetic acid is ______ acidic than acetic acid due to ______ effect. (iii) An acidic buffer is prepared by taking equimolar solution of ______ acid and its salt with a _____ base. (iv) Ozonolysis of 2-methyl pent-2-ene shall give ______ and _________. (b) Complete the following by selecting the correct alternatives from the choices given: (i) The permissible set of all four quantum numbers for an electron are: (a) n=2 l =1 m=0 , s =0 (b) n=3 l =2 m= +3 s=+1/2 (c) n = 3 l=0 m=0 s = -1/2 (d) n=2 m=+2 s=+1/2 l=3 [4x1] SPECIMEN PAPER ISC 2018 CLASS XI

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