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12th Standard Chemistry English Medium Surface Chemistry Reduced Syllabus Important Questions With Answer Key 2021

12th Standard

    Reg.No. :
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Chemistry

Time : 01:00:00 Hrs
Total Marks : 100

    Multiple Choice Questions

    15 x 1 = 15
  1. Which one of the following is an example for homogeneous catalysis?

    (a)

    manufacture of ammonia by Haber’s process

    (b)

    manufacture of sulphuric acid by contact process

    (c)

    hydrogenation of oil

    (d)

    Hydrolysis of sucrose in presence of all HCl

  2. Match the following

    a V2O5 i High density polyethylene
    b Ziegler – Natta ii PAN
    c Peroxide iii NH3
    d Finely divided Fe iv H2SO4
    (a)
    A B C D
    iv i ii iii
    (b)
    A B C D
    i ii iv iii
    (c)
    A B C D
    ii iii iv i
    (d)
    A B C D
    iii iv ii i
  3. On which of the following properties does the coagulating power of an ion depend ?

    (a)

    Both magnitude and sign of the charge on the ion.

    (b)

    Size of the ion alone

    (c)

    the magnitude of the charge on the ion alone

    (d)

    the sign of charge on the ion alone.

  4. Which among the following does not affect adsorption?

    (a)

    surface area of the adsorbent

    (b)

    catalyst

    (c)

    temperature

    (d)

    pressure

  5. Pick the odd one out.

    (a)

    dialysis

    (b)

    electro dialysis

    (c)

    electrophoresis

    (d)

    ultrafiltration

  6. Which among the following reactions is an example of auto catalysis?
    i) CH3COOC2H5+H2O➝ CH3COOH+C2H5OH
    ii) 2H2O➝2H2O+O2
    iii) 2SO2+O2➝2SO3
    iv) 2AsH3➝2As+3H2

    (a)

    only (i)

    (b)

    (i) and (ii)

    (c)

    (i) and (ii)

    (d)

    (i) and (iv)

  7. Colloids are purified by

    (a)

    precipitation

    (b)

    coagulation

    (c)

    dialysis

    (d)

    filtration

  8. When the operation force between the absorbent and adsorbate is weak Vander waal's force, then it is called

    (a)

    physicaladsorption

    (b)

    chemicaladsorption

    (c)

    Vanderwaal'sadsorptio

    (d)

    both (a) and (c)

  9. Pick out the dispersion method of preparation of colloids

    (a)

    oxidation

    (b)

    changeof physicalstate

    (c)

    reduction

    (d)

    peptisation

  10. Brownian movement of colloidal particles is a______property.

    (a)

    Kinetic

    (b)

    Electrica

    (c)

    Optical

    (d)

    Magnetic

  11. When the surface area of the adsorbent increases, adsorption__________

    (a)

    increases

    (b)

    decreases

    (c)

    remains constant

    (d)

    first decreasesand then increases

  12. In auto catalysis____________ acts as catalyst

    (a)

    reactant

    (b)

    produc

    (c)

    both

    (d)

    none

  13. The platinum catalyst used in the oxidation of SO2 by contact process is poisoned by

    (a)

    As2O3

    (b)

    V2O5

    (c)

    Fe2O3

    (d)

    CuCl2

  14. Emulsifying agent is used for__________

    (a)

    precipitation of an emulsion

    (b)

    coagulation of an emulsion

    (c)

    stabilization of an emulsion

    (d)

    none of these

  15. Argyrol is__________

    (a)

    colloidal silver

    (b)

    colloidal antimony

    (c)

    colloidal gold

    (d)

    milk of magnesia

  16. 2 Marks

    10 x 2 = 20
  17. Which will be adsorbed more readily on the surface of charcoal and why; NH3 or CO2?

  18. Defme adsorption isotherm.

  19. What are limitations of Freundlich adsorption isotherm?

  20. What is ultrasonic dispersion?

  21. Write a note on dialysis.

  22. What are the two types of catalysis?

  23. Explain the kinetic property of colloids.

  24. Which will adsorb more gas, a lump of charcoal or its powder and why?

  25. Adsorption of a gas on the surface of solid is generally accompanied by decrease in entropy. Still it is a spontaneous process. Explain.

  26. Why the sun looks red at the time of setting? Explain on the basis of colloidal properties.

  27. 3 Marks

    10 x 3 = 30
  28. What happens when a colloidal sol of Fe(OH)3 and AS2O3 are mixed?

  29. What are the factors which influence the adsorption of a gas on a solid?

  30. Give any three application of adsorption.

  31. What are the important concepts of catalysis that adsorption theory explains?

  32. Write a note on Ultrafilteration?

  33. What are the advantages of Brownian movement?

  34. What are the tests used to identify the type of emulsion?

  35. Write the optical properties of colloids with diagram.

  36. For the coagulation of 100 ml of arsenious sulphide sol, 5 ml of 1 M NaCI is required. What is the flocculation value of NaCl?

  37. Explain the meaning of the statement. 'Adsorption is a surface phenomenon'.

  38. 5 Marks

    7 x 5 = 35
  39. Describe adsorption theory of catalysis

  40. Explain the factors affecting adsorption.

  41. Write a note on Freundlich adsorption isotherm.

  42. Give the special characteristics of enzyme catalysed reactions.

  43. Write a note on phase transfer catalysis.

  44. Explain electrodialysis

  45. Explain the electrical property of colloids! with a neat diagram.

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