Himachal Pradesh Chemistry Model Question Paper : Plus Two / 12th Std / +2 www.hpeducationboard.nic.in

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Document Described : Chemistry Question Paper, Himachal Pradesh Question Paper

Himachal Pradesh Board of School Education
MODEL QUESTION PAPERS
Plus Two Examination March 2009
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.

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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 (d) Ni 1
Q4. The rate constant of a reaction is 1.2×10–5 mol–2 litre² 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 (c) Ag (d) Cu 1
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
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:
Al3+ + 3e t Al(S) 2
Q13. Write the mechanism of rusting of iron. 2
Q14. Describe the following terms:
(i) Electrodialysis (ii) Emulsion 2
Q15. (a) Give two examples of interhalogen compounds.
(b) Oxygen exist as gas while sulphur exist as a solid at room temperature. Why? 1+1=2
Q16. (a) Name the phenomenon responsible for the similar properties of Zr and Hf. Define it.
(b) Why is the separation of lanthanoids difficult ? 1+1=2
Q17. How is potassium dichromate prepared from chromite ? 2
Q18. (a) Write the IUPAC system name of the complex compound:
NH4 [Cr (NH3)2 (NCS)4] 1
(b) Discuss the bonding in [Fe (CH)6]3– . 2
OR
(a) Define coordination entity. 1
(b) How many geometrical isomers of
[Cr (en)2 Cl2]+ exist ? Which of these show optical activity ? 2
Q19. (a) Why chlorobenzene is less reactive than chloroethane ? Explain. 2
(b) How can you convert methyl chloride to ethyl chloride ? 1
Q20. Write a note on the following:
(a) Keimer - Tiemann Reaction
(b) Coupling Reaction
(c) Williamson's Synthesis 1+1+1=3
Q21. (a) Define ppm. 1
(b) A solution of glucose in water is labelled as 10% (w/w). The density of the solution is 1.20 gm L–1. Calculate molality of solution. 2
OR
(a) Define Van't Hoff Factor 1
(b) 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
Q22. (a) Define activation energy. 1
(b) A first order reaction is 20% complete in 10 minutes. Calculate the
time for 75% completion of reaction. 2
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. 1+1+1=3
Q24. (a) How can you distinguish between: aldehydes and ketones 1
(b) Write a note on the following:-
(i) H.V.Z. - Reaction
(ii) Cannizzaco's Reaction 2
Q25. (a) What type of bonds hold a DNA double helix together ? 1
(b) What are proteins ? State their biological importance. 2
Q26. (a) Give chemical reaction for Gabriel's phthalimide synthesis. 1
(b) Explain, why ethyl amine is more basic than aniline. 2
(c) How will you convert aniline to phenol. 1
OR
(a) Give chemical reaction for diazotization reaction and Hoffmann Bromide reaction.
(b) 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
Q27. (a) Write the monomers of Terylene. 1
(b) Give the preparation of :
(i) Buna - S
(ii) Orlon 2
(c) Define the Double Base Propellants. 1