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

5 pages, 68 questions, 22 questions with responses, 24 total responses,    0    0
Kishor Bisht
The Indian Public School, Dehradun
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THE INDIAN PUBLIC SCHOOL, DEHRADUN PAPER 1(THEORY) [ PRE-BOARD-2] Date -01/02/17 (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 deg mol 1 = 8.314 J K 1 mol 1 = 0.0821 dm 3 atm K 1 mol 1 1 l atm = 1 dm 3 atm = 101.3 J. 1 Farday = 96500 Coulombs PART I Answer all questions Question1 (a) Fill in the blanks with appropriate words given below : ( decreases, aldol reaction, two degree , cannizaro reaction , one degree, NH3, ketone, NH- , increases , Formaldehyde, , three degree, remain same, ) (i) Carbylamines test is given by-------------- amine. (ii) Formaldehyde undergo ------------- reaction in presence of dil.NaOH (iii) Conjugate acid of NH2- ion is -----------(iv) when a solute is dissolved in a solvent , the vapour pressure of the solution ---------(v) Ammonia when heated with --------- yield urotropine. (B) Complete the following statements by selecting the correct alternative from the choices given (a)Magnesium displaces hydrogen from dilute acid solution because: (i) The oxidation potential of magnesium is less than that of hydrogen. (ii) The reduction potential of magnesium is less than that of hydrogen. (iii) Both magnesium and hydrogen have same oxidation potential. (iv) Both magnesium and hydrogen have same reduction potential (b) Out of the following solution which is highest boiling point (i) 0.1M NaCl (ii) 0.1M BaCl2 (iii) 0.1M KNO3 (iv) 0.1M K4[Fe(CN)6] (c)75% of a first order reaction complete in 32 minutes . When was 50% of the reaction completed ? (i) 24minute (ii) 16 minute (iii) 8 minute (iv) 4 minute

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