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Class 12 ISC Board Exam 2018 : Chemistry

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Suresh Balan
SDR School, Tuticorin

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CHEMISTRY PAPER 1 (THEORY) (Three Hours) Answer to this paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. 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 K-1 mol-1 : Avogadro s number = 6.023 X 1023 PART I (20 Marks) (Answer ALL questions) Question: 1 a) Complete the following statements by selecting the correct alternatives from the choices given: [4 X 1] (i) Which of the metal is leached by cyanide process? (a) Ag (ii) (b) Hg2O (c) Hg(OH)2 (d) HgCl2 (b) + 4 (c) + 7 (d) + 6 (b) Antiseptic (c) Insecticide DDT is used as: (a) Anaesthetic b) (d) Cu In KMnO4 oxidation number of Mn is: (a) +2 (iv) (c) Al Tailing of Mercury is due to the formation of: (a) HgO (iii) (b) Na Fill in the blanks: (d) Refrigerant [4 X 1] (i) The well known refrigerant Freon has the structure ____. (ii) IUPAC name of picric acid ______. (iii) The common name of 1,2,3 trihydroxy-benzene is ________. (iv) Oxygenated water is _____________. Page 1 of 5

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