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CBSE Class 12 Pre Board 2019 : Chemistry - Prelim 2 (St Xavier's Sr. Sec. School, Delhi)

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Pre Board Examination 2019 Std. 12 21-01-2019 Set 2 Max. Marks : 70 Time : 3 hrs. CHEMISTRY General instructions: i) All questions are compulsory. ii) Section A : Q. No. 1 to 5 are short answer questions and carry 1 marks each. iii) Section B : Q. No. 6 to 12 are short answer questions and carry 2 marks each. iv) Section C : Q. No. 13 to 24 are short answer questions and carry 3 marks each. v) Section D : Q. No. 25 to 27 are long answer questions and carry 5 marks each. vi) There is no overall choice. However an internal choice has been provided in two questions of one mark, two questions of two marks, four questions of 3 marks and all the questions of five marks weightage. You have to attempt only one of the choices in such questions. vii) Use log tables if necessary, use of calculator not allowed. Section A 1. What type of magnetism is shown in the following alignment of magnetic moment? (OR) What type of point defect is produced when AgCl is doped with CdCl2? (1) 2. Write a method by which lyophobic colloids can be coagulated. (1) 3. On the basis of crystal field theory, write the electronic configuration of d in terms of t2g and eg in an octahedral field when o < P. (OR) Give evidence that [ Co (NH3)5Cl ]SO4 and [Co (NH3)5 SO4]Cl are ionisation isomers. (1) 4. Identify the compound which on hydrogenation produces an optically active compound from the following compounds: 5. What are reducing sugars? Give an example. 4 (1) (1) Section B 6. 3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van t Hoff factor and predict the nature of the solute (associated or dissociated) -1 -1 Molar mass of benzoic acid = 122 g mol , Kf for benzene = 4.9 K Kg Mol ) (OR) Calculate the molality of ethanol solution in which the mole fraction of water is 0.88. (2) 7. Identify the reaction and write the IUPAC name of the product formed. Br2 / Red Phosphorous a) CH3 CH2 COOH b) O Cl H2 Pd BaSO4 8. (OR) Write the structures and IUPAC names of cross aldol condensation products only of ethanal and propanal. (2) For a reaction R P, half life is observed to be independent of the initial concentration of reactants. What is the order of the reaction? Define activation energy of a reaction. (2) a) b)

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