Tuesday, 20 November 2018

JKBOSE 12th chemistry paper 2018

Given below is the complete JKBOSE 12th Chemistry Paper 2018 annual, the examination of which was held in November 2018 Kashmir division. This Chemistry paper by JKBOSE has a total of 21 questions with maximum marks 70 and the allotted time of 3 hours.

(Long Answer Type Question)-(5 marks each)

1. What is 'depression in freezing point'? Derive a relationship between depression in freezing point and molar mass of solute.
Or
What is 'Vant Hoff factor'? How is it related to degree o dis dissociation of the electrolyte in the solution? What is its value when solute undergoes association?

2. What is a fuel cell ? Give the construction and working Of a fuel cell.
Or
What is Corrosion? Explain the electrochemical theory of rusting.

3. How is nitric acid prepared by Ostwald’s process? Briefly express the various steps involved in it. Give its reaction with zinc.
Or
Write the electronic configurations of the elements of Group-17. Why fluorine shows anomalous behaviour. Discuss the oxidation states of the elements of Group-17.

4. Give two methods of preparation of Acetic acid. How does it react with:
    (i) C12 in presence of red phosphorus.
    (ii)  PCl5.
   (iii) C2H50H.
Or
How acetone is prepared from:
    (i) Acid chloride?
    (ii) Alkynes?
   (iii) Calcium acetate?
What happens when acetone is treated with:
    (i) Sodium bisulphite?
    (ii)  Grignard's reagent?

(Short Answer Type Questions)-(3 marks each)

5. Explain Schottky defect in ionic crystals.
6. Differentiate between homogeneous and heterogeneous catalysis with one example of each.
7. Define the following terms with examples:
    (i) Coordination complex
    (ii) Bidentate ligand.
8. Define half-life period. Show that half-life period for 1st order reaction is independent of the initial concentration Of the reactants.
9. What are Alcohols? Explain primary, secondary and tertiary alcohols with examples.
10. What are transition elements? Why are they called d-block elements? Write the electronic configuration of the first and last member of the 3d transition series.
11. What are Carbohydrates? How are they classified?
12. What is Allotropy? Write the various allotropic forms of sulphur.

(Very Short Answer Type Questions)-(2 marks each)

13. Define order and molecularity of a reaction.
14. What is the difference between mineral and ore?
15. What are the consequences of the Lanthanide contraction?
16. What is 'Wurtz reaction'?
17. Starting from bromoethane how will you get:
     (i) Nitroethane.
     (ii) Ethane.
18. What is Carbylamine reaction?
19. What are Tranquilisers ? Give one example.
20. Give chemical reaction for the preparation of Nylon 6,6.

(Objective Type Questions)-(1 mark each)

21. (i) The number of octahedral sites per sphere in fcc is .......
      (ii) The zig-zag movement Of the colloidal particles in a colloidal sol is called .......
      (iii) The reaction of methylisocyanide with HgO produces ......
      (iv) What is Roasting?
       (v) Write IUPAC name of (CH3)3CO
       (vi)  Fehling solution test can be given by HCOOH but not by other acids. (True/Fa1se)-
      (vii) Benzylamine is stronger base than aniline. (True/Fa1se)
      (viii) Which of the following bases is not present in DNA?
               (a) Adenine.
               (b) Guanine.
               (c) Uracil.
               (d) Cytosine.
        (ix) Antipyretics are medicinal compounds which:
               (a) control malaria.
               (b) lower body temperature.
               (c) Relieve pain.
               (d) can kill other organisms.
          (x) Bakelite is obtained from phenol by reacting with:
                (a) Ethanal.
                (b) Methanal.
                (c) Vinyl chloride.
                (d) Ethylene glycol.

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