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ISC Class XII Board Specimen 2022 : Chemistry [Semester 2]

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ISC 12th
Indian School Certificate Examination (ISC), New Delhi
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ISC SEMESTER 2 EXAMINATION SPECIMEN QUESTION PAPER CHEMISTRY PAPER 1 (THEORY) ---------------------------------------------------------------------------------------------------Maximum Marks: 35 Time allowed: One and a half hour Candidates are allowed an additional 10 minutes for only reading the paper. They must NOT start writing during this time. --------------------------------------------------------------------------------------------------------------------- All questions are compulsory The intended marks for questions or parts of questions are given in brackets. [ ] All working, including rough work, should be done on the same sheet as, and adjacent to the rest of the answer. 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. --------------------------------------------------------------------------------------------------------------------- SECTION A 7 MARKS Question 1 Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: (two, four, sec-1, diamagnetic, acetaldehyde, mol-1L sec-1, paramagnetic, formaldehyde, acetone, ethanol) (i) When the concentration of a reactant of first order reaction is doubled, the rate of reaction becomes ___________ times. The unit of rate constant (k) for the first order reaction is __________. [1] (ii) The transition metals show ___________ character because of the presence of unpaired electrons while Cu+ is ___________ because its electronic configuration is [Ar]3d10. [1] (iii) Calcium formate on distillation gives ___________ but the distillation of calcium formate and calcium acetate gives ___________. [1] 1

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