Full Portion Three Marks Question Paper

12th Standard EM

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Chemistry

Time : 01:30:00 Hrs
Total Marks : 60
    20 x 3 = 60
  1. Give the uses of zinc.

  2. Explain the following terms with suitable examples.
    (i) Gangue
    (ii) slag

  3. Before reduction, the ore is first convertedI into the oxide of metal of interest. Gtve reason

  4. Write a short note on hydroboration

  5. How will you prepare chlorine in the laboratory?

  6. Give the uses of argon.

  7. Calculate the number of unpaired electrons in Ti3+ , Mn2+ and calculate the spin only magnetic moment.

  8. Explain the variation in E0M3+/M2+  3d series.

  9. Give the difference between double salts and coordination compounds.

  10. Explain briefly the collision theory of bimolecular reactions

  11. How can the following conversion be effected? (i) Phenol to phenolphthalein.

  12. Explain Stephen's reaction.

  13. Organic compound with molecular formula C3H6O has two isomers (A) and (B). (A) on heating with NaOH in I2 forms a yellow precipitate while (B) does not. Identify the isomers A and B and explain the reactions.

  14. Aniline reacts with Br2/H2O to give a tribromo derivative. How would you convert aniline to get a monobromo derivate?

  15. Write a reaction that indicates the presence of an aldehyde group in glucose.

  16. Give the sources of vitamin A and E and list the deficiency disease caused by lack of vitamin A and E in diet.

  17. What are drugs? How are they classified

  18. Explain the mechanism of cleansing action of soaps and detergents

  19. Name some important categories of food additives.

  20. Write the preparation of neoprene and give its use.

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