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HIMACHAL PRADESH MAR 2008 : Chemistry

3 pages, 56 questions, 1 questions with responses, 1 total responses,

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CHEMISTRY Time Allowed : 3 Hrs. Max. Marks 60 Special Instructions :1. You must write question paper series in the circle at top left side of title page of your Answer-book. 2. All questions are compulsory. Internal choices have been given in some questions. 3. Question Nos. I to VI are multiple choice questions (MCQ) carry 1 (one) mark each. Choose one correct answer among four options. 4. Question Nos VII to X are very short answer type carrying 1 (one) mark each. Answer these questions in about one word or one line. 5. Question Nos. XI to XVII are short answer type carrying 2 (Two) marks each. Answer these questions in about 30 words each. 6. Question Nos. XVIII to XXV are short type carrying 3 (three) marks each. Answer these questions in about 40 words each. 7. Question Nos. XXVI to XXVIII are long type carrying 4 (four) marks each. Answer these questions in about 50 words each. 8. Do not leave blank page / pages in your answer-book. Q1. The coordination number of a metal crystallising in a hexagonal close packing structure is : (a) 12 (b) 4 (c) 8 (d) 6 1 Q2. The boiling point of solvent containing a non-volatile solute :(a) is decreased (b) is elevated (c) does not change (d) None of the above 1 Q3. Galvanised iron sheets are coated with : (a) C (b) Cu (c) Zn 1 (d) Ni Q4. The rate constant of a reaction is 1.2 10 5 mol 2 litre S 1. The order of a reaction is : (a) Zero (b) 1 (c) 2 (d) 3 1 Q5. Which type of property is the Brownian movement of colloidal sol ? (a) Electrical (b) Optical (c) Mechanical (d) Colligative 1 Q6. Cinnabar is an ore of :(a) Hg (b) Zn 1 (c) Ag (d) Cu Q7. Define inert pair effect. 1 Q8. What is the shape of chromate ion ? 1 Q9. Write the IUPAC name of iso - butyl alcohol. 1 (22) Q10. What happen when chloroform is exposed to air and sun light ? 1 Q11. Write the four differences between Schottky defects and Frenkel defects. 2 Q12. How many coulombs are required to deposit 50 gm of aluminium when the electrode reaction is : 2 Al3+ + 3e t Al(S) Q13. Write the mechanism of rusting of iron. 2 Q14. Describe the following terms : (i) Electrodialysis (ii) Emulsion 2 Q15. (a) (b) Q16. (a) (b) Give two examples of interhalogen compounds. Oxygen exist as gas while sulphur exist as a solid at room temperature. Why? 1+1=2 Name the phenomenon responsible for the similar properties of Zr and Hf. Define it. Why is the separation of lanthanoids difficult ? 1+1=2 Q17. How is potassium dichromate prepared from chromite ? Q18. (a) (b) (a) (b) Q19. (a) (b) Write the IUPAC system name of the complex compound : NH4 [Cr (NH3)2 (NCS)4] Discuss the bonding in [Fe (CH)6]3 . OR Define coordination entity. How many geometrical isomers of [Cr (en)2 Cl2]+ exist ? Which of these show optical activity ? Why chlorobenzene is less reactive than chloroethane ? Explain. How can you convert methyl chloride to ethyl chloride ? Q20. Write a note on the following : (a) Keimer - Tiemann Reaction (b) Coupling Reaction (c) Williamson's Synthesis Q21. (a) (b) (a) (b) 2 1 2 1 2 2 1 1+1+1=3 Define ppm. 1 A solution of glucose in water is labelled as 10% (w/w). The density of the 2 solution is 1.20 gm L 1. Calculate molality of solution. OR Define Van't Hoff Factor 1 A solution containing 12.5 gm of a non-electrolyte substance in 175 gm of water gave boiling point elevation of 0.70 K. Calculate the molar mass of the substance. (K6 for water = 0.52 K Kg mol 1) 2 (23) Q22. (a) (b) Define activation energy. A first order reaction is 20% complete in 10 minutes. Calculate the time for 75% completion of reaction. Q23. Explain the following : (a) PbQ2 is more stable than PbCl4. (b) NH3 has higher boiling point than PH3. (c) BF3 is a weaker Lewis Acid than BCl3. Q24. (a) (b) How can you distinguish between : aldehydes and ketones Write a note on the following :(i) H.V.Z. - Reaction (ii) Cannizzaco's Reaction 1 2 1+1+1=3 1 2 Q25. (a) (b) What type of bonds hold a DNA double helix together ? What are proteins ? State their biological importance. Q26. (a) (b) (c) Give chemical reaction for Gabriel's phthalimide synthesis. 1 Explain, why ethyl amine is more basic than aniline. 2 How will you convert aniline to phenol. 1 OR Give chemical reaction for diazotization reaction and Hoffmann Bromide reaction. What happen when : (i) Methyl isocyanide is treated with ozone. (ii) Methyl amine is treated wth sodium nitrite and cold dil. HCl solution. 2+2 Write the monomers of Terylene. 1 Give the preparation of : (i) Buna - S (ii) Orlon 2 Define the Double Base Propellants. 1 (a) (b) Q27. (a) (b) (c) Q28. (a) (b) (c) 1 2 Define Vat Dyes Write a note on Zone refining. Complete the following reaction :(i) CH3COCH3 + 4HI Red P t 423 K (ii) (CH3)2 CHOH + Cu 573 K ?+ ?+ ? t?+? (24) 2

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Additional Info : Model Question Papers Of Plus Two Examination March 2008 Chemistry
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