+2 / 12th Std / Plus Two Jharkhand : Chemistry Model Question Paper www.jac.nic.in

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Document Described : Chemistry Question Paper, Jharkhand Question Paper

CHEMISTRY
(Compulsory)
Full Marks : 70
Pass Marks : 23
Time : 3 Hours
All questions are compulsory.
Candidates are required to give their answers in their own words as far as practicable.
Question Nos. 1 to 5 carry 1 mark each.
Question Nos. 6 to 12 carry 2 marks each.
Question Nos. 13 to 24 carry 3 marks each.
Question Nos. 25 to 27 carry 5 marks each.

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1. What is the co-ordination number of Na+ in NaCl structure ?
2. Define mole fraction of a component in a solution.
3. Give one example of 1st order reaction.
6. Write monomers for the folowing polymers :
(a) PVC
(b) Teflon.
7. Write reactions with conditions for the folowing conversions :
8. Assign a reason for each of the folowing :
9. (a) Write stereoisomers having molecular formula C4H8.
(b) Write extreme conformational isomers of ethane.
10. Write balanced equation for the following reactions:
(a) BF3 + LiH
(b) Ca3P2 + H2O
11. How are formaline and trioxane related methanal ?
12. Find bond order of folowing species and state which is more stable :
14. A 4% solution of sucrose is isotonic with 3% solution of an unknown organic substance. Calculate the molecular mass of the unknown substance.
15. Calculate the entropy change involved in the conversion of 1 mole of liquid water at 373 K to vapour of the same temperature (Latent heat of vapourization of water, Hvap = 2.257 kJ/gm).
16. (a) How is acetone prepared in the laboratory ?
(b) What happens when, acetone reacts with:
17. Folowing reaction takes place in one step
2NO(g) + O2(g) 2NO2(g)
How will the rate of the above reaction changes if the volume of the reaction vessel is diminished by one-thired of its original volume ?
18. Using valence bond approach, predict the shape and magnetic behaviour of [Ni(CN)4]2? and [NiCl4]2?.
19. What are Antibiotics, Antacids and Analge- sics ?
20. (a) Explain Group Displacement law.
21. How will you carry out the following conversions ?
(a) Ethyl alcohol to Acetone
(b) Ethylamine to Acetaldehyde.
22. (a) Arrange the following in order of increasing acid strength : Phenol, p-nitrophenol and p-cresol
(b) Which is more basic ? Aniline or Ethylamine ?
(c) Which has higher boiling point ? Acetoneor Ethylalcohol ?
23. State the hybridization of central atom and shapes of folowing molecules:
24. What are Homopolymer and Copolymers ? Give one example of each type of polymer.
25. (a) Write the cause and consequences of Lanthanide contraction.
27. Write two ores of zinc. How zinc-metal is extracted from its ore by carbon reduction process ?