Chemistry Sample paper 3

Sample Paper – 2009

Class – XII

Subject – Chemistry

 

Time: Three Hours Max. Marks: 70

 

General Instructions

 

1. All questions are compulsory.

 

2. Question nos. 1 to 8 are very short answer questions and carry 1 mark each.

 

3. Question nos. 9 to 18 are short answer questions and carry 2 marks each.

 

4. Question nos. 19 to 27 are also short answer questions and carry 3 marks each.

 

5. Question nos. 28 to 30 are long answer questions and carry 5 marks each.

 

6. Use log tables if necessary, use of calculators is not allowed.

 

   1. Name the non- stoichiometric defect responsible for colour in alkali halides.

   2. A reaction is first order in A and second order in B. How is the rate affected when concentration of B is tripled?

   3. Give the IUPAC name of CH3CH(OH)CH2CH2CH2CH2CHO.

   4. A group 14 element is to be converted into n –type semi conductor by doping it with suitable impurity .To which group should this impurity belong?

   5. A reaction is first order in A and second order in B. How is the rate affected when the concentration of both A and B is doubled.

   6. Give the structure of : 5-Oxohexanoic acid.

   7. In the ring test for identification of nitrate ion, what is the formula of the compound responsible for the brown ring formed at the interface of two liquids?

   8. What type of bonding helps in stabilizing the a-helix structure of proteins.

   9. Aluminium crystallizes in a cubic close packed structure. Its’ metallic radius is 125 pm. (a) what is the length of the side of the unit cell.

      (b) How many unit cells are there in 1cm3 of aluminium

  10. How do you account for molar conductivity of strong and weak electrolyte with concentration? Plot the graphs also.

  11. Explain the Electrophoresis with diagrams.

  12. (a) Name the catalyst and the promoter used in Haber’s process for

 

Manufacture of ammonia.

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