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[QUOTE=mariammal;186227][B]Document Described : [/B]Chemistry Question Paper, Jharkhand Question Paper
[B]
CHEMISTRY
(Compulsory)[/B]
[B]Full Marks  [/B]: 70
[B]Pass Marks  [/B]: 23
[B]Time  [/B]: 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.

[URL]http://jac.nic.in/model_questions.htm[/URL]
[URL]http://jac.nic.in/pdf/model_questions/Science_Chemistry12_08.pdf[/URL]

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 ?[/QUOTE]

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