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CBSE XII Pre Boards 2015 : CHEMISTRY with Answers (KV Kolkata)

9 pages, 80 questions, 55 questions with responses, 89 total responses,    0    0
Kendriya Vidyalaya No.1 Salt Lake
Kendriya Vidyalaya (KV) No. 1, Salt Lake
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KENDRIYA VIDYALAYA SANGATHAN, KOLKATA REGION 2 Pre Board Examination 2014-15 nd Class XII Subject: Chemistry Time allowed : 3 hours Maximum marks: 70 General instructions: (i) All questions are compulsory. (ii) Question numbers 1 to 5 are very short answer questions & carry 1 mark each. (iii) Question numbers 6 to 10 are short answer questions & carry 2 marks each. (iv) Question numbers 11 to 22 are also short answer questions & carry 3 marks each. (v) Question number 23 is a value based question & carry 4 marks. (vi) Question numbers 24 to 26 are long answer questions & carry 5 marks each. (vii) Use log tables, f necessary. Use of calculators is not allowed. ----------------------------------------------------------------------------------------------------------------------------------------------.1) Write an example of an anti ferro magnetic substance. [1] . 2) What is a colloidion? [1] 3) Write the IUPAC name of ionization isomer of [Co(H2O)5Cl ]SO4. H2O. [1] 4) Which isomer of C4H9Br undergoes SN1 reaction easily & why? [1] .5) Explain: Aniline does not undergo Friedel-Crafts reaction. [1] 6) The vapour pressure of pure benzene at a certain temperature in 0.85 bar. A non volatile, non electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar mass 78 g/mol). the Vapour pressure of the solution is then 0.845 bar. What is the molar mass of the solid substance? [2] .7) (a) What is the order & molecularity of the following elementary reaction: 2A + B D; the rate law expression is r=k [A] [B] ? (b) How does a catalyst affect the rate of a chemical reaction ? [2] 8) (a) Which is more stable & why- white phosphorus or red phosphorus? (b) Write the reaction of thermal decomposition of sodium azide. [2] Or (a) Although electron gain enthalpy of fluorine is less negative than that of chlorine, fluorine is a stronger oxidizing agent than chlorine. Why? (b) Complete the equation: Cl2 + NaOH (hot & conc.) nd ? KVS RO, Kolkata 2 Pre Board examination 2014-15 Class XII (Chemistry Question paper) [2]

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Additional Info : KV Sangathan, Kolkata Region CHEMISTRY Pre-Board
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