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ISC Class XII Board Exam 2019 : Chemistry

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ISC SOLVED PAPER - 2019 Class XII CHEMISTRY (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 question are compulsory Question 1 is of 20 marks having four sub parts, all of which are compulsory. Question number 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 1 mol 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 brackets : [4 1] (more than, primary, cathode, Lucas reagent, two, four, less than, Grignard's reagent, tertiary, anode, zero, equal to, three) (i) The elevation of boiling point of 0.5 M K2SO4 solution is __________ that of 0.5 M urea solution. The elevation of boiling point of 0.5 M KCl solution is __________ that of 0.5 M K2SO4 solution. (ii) A mixture of conc. HCl and anhydrous ZnCl2 is called __________ which shows maximum reactivity with ________ alcohol. (iii) In electrolytic refining the impure metal is made __________ while a thin sheet of pure metal is used as __________. (iv) When the concentration of a reactant of first order reaction is doubled, the rate of reaction becomes __________ times, but for a __________ order reaction, the rate of reaction remains the same. (b) Complete the following statements by selecting the correct alternative from the choices given : [4 1] (i) The cell reaction is spontaneous or feasible when emf of the cell is : (1) negative (2) positive (3) zero (4) either positive or negative (ii) Which, among the following polymers, is a polyester : (1) melamine (2) bakelite (3) terylene (4) polythene (iii) The correct order of increasing acidic strength of the oxoacids of chlorine is : (1) HClO3 < HClO4 < HClO2 < HClO (2) HClO < HClO2 < HClO3 < HClO4 (3) HClO2 < HClO < HClO4 < HClO3 (4) HClO3 < HClO4 < HClO < HClO2 (iv) A catalyst is a substance which : (1) changes the equilibrium constant of the reaction. (2) increases the equilibrium constant of the reaction. To know about more useful books for class-12 click here

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