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Class 12 ISC Prelims 2017 : Chemistry (The Indian Public School, Dehradun)

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Kishor Bisht
The Indian Public School, Dehradun
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THE INDIAN PUBLIC SCHOOL, DEHRADUN CHEMISTRY PAPER 1(THEORY) [ PRE-BOARD-1] Date -14/12/16 (Three Hours) KSB[12] (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time) -------------------------------------------------------------------------------------------------------------------------Answer all questions in Part I and six questions from Part II, choosing two questions from Section A, two from Section B and two from Section C. 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 1 l atm = 1 dm 3 deg 1 mol 1 = 8.314 J K 1 mol 1 = 0.0821 dm 3 atm K 1 mol 1 atm = 101.3 J. 1 Farday = 96500 Coulombs PART I Answer all questionss Question1 (a) Fill in the blanks with appropriate words given below : (Isopropane, oxidising, molar concentration, Above, increases, decreases, blue reducing, monodentate, polyamide, bidentate, HCl, NaCl, concentrated H2SO4,Ionic concentration, concentration) (i) Law of mass action state that the rate at which a substance reaction proportional to its -------(ii) Oxalate ion is a----------- ligand while NH3 is a ---------- ligand (iii) an aqueous solution of sugar is boils hundred 1000C and freezes ------00C (iV) MnO2 when heated with----------- and--------- liberates chlorine (v) the monomer of natural rubber is-----(B) Complete the following statements by selecting the correct alternative from the choices given (a) Manufacture of NH3 by Haber,s process is favoured by : (i) High temperature, low pressure (ii) low temperature, high pressure (iii) high temperature and pressure (iv) low temperature and pressure (b) Sulphur can be extracted from deposits in Earth crust by (i) Froth flotation process (ii) Frasch process (iii) frankel process (iv) friedel craft process

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