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12th Chemistry Practice paper-04

3 pages, 63 questions, 14 questions with responses, 14 total responses,    0    0
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CHEMISTRY Class II PreUni Plus 2016-2017 Practice Paper - 04 Take Home Max. Marks Duration 70 3 hours 15 minutes Instructions 1. The questions paper has four parts: A, B, C and D. All parts are compulsory. 2. Write balanced chemical equations and draw labeled diagrams wherever required. 3. Use log tables and the simple calculator if necessary (Use of scientific calculators is not allowed). PART - A I. Answer the following questions (one mark each) [10 1 = 10] 1. Under what condition van t Hoff factor i is less than one? 2. How is Henry s law constant (KH) related to the solubility of a gas? 3. What is the quantity of electricity required to liberate 1 mole of O2 gas from water? 4. What is the effect of temperature on half life period of a first order reaction? 5. Which one of the following has higher flocculation value for a negatively charged colloid: NaCl, MgCl2, AlCl3? 6. Why coke is not used as a reducing agent for Cr2O3? 7. What prompted Neil Bartlett to prepare Xe[PtF6]? 8. Solubility of haloalkanes in water is very low although they are polar in nature. Give reason. 9. How many moles of alcohol are required to convert one mole of an aldehyde into acetal? 10. Write the structure of -amino acid below isoelectric point. PART - B II. Answer any FIVE of the following questions (two marks each) [5 2 = 10] 11. What is Schottky defect? Give an example of a compound which possesses both Schottky and Frenkel defect. 12. State Kohlrausch s law. Write the equation for the calculation of of Ba(OH)2 using suitable strong electrolytes. 13. Explain with an example why rate of a reaction does not change when some reactions are carried out on the surface of a substance. Mention the order of the reaction. 14. Name the element in the 3d series (a) which contains maximum number of unpaired electrons (b) which is colourless in +2 oxidation state [1 + 1] 15. Explain the preparation of tertiary alcohol from Grignard reagent. 2P1617CPP4 1

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