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Surface Chemistry

12th Chemistry - Surface Chemistry Model Question Paper

Surface Chemistry Model Question Paper

12th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 35
    5 x 1 = 5

  1. For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.

    (a)

    \(\frac{1}{n}\), K

    (b)

    log\(\frac{1}{n}\), K

    (c)

    \(\frac{1}{n}\), log K

    (d)

    log \(\frac{1}{n}\), log K

  2. Which one of the following characteristics are associated with adsorption?

    (a)

    \(\Delta\)G and \(\Delta\)H are negative but \(\Delta\)S is positive

    (b)

    \(\Delta\)G and \(\Delta\)S are negative but \(\Delta\)H is positive

    (c)

    \(\Delta\)G is negative but \(\Delta\)H and \(\Delta\)S are positive

    (d)

    \(\Delta\)G, \(\Delta\)H and \(\Delta\)S all are negative.

  3. Hair cream is _____.

    (a)

    gel

    (b)

    emulsion

    (c)

    solid sol

    (d)

    sol.

  4. The phenomenon observed when a beam of light is passed through a colloidal solution is_______.

    (a)

    Cataphoresis

    (b)

    Electrophoresis

    (c)

    Coagulation

    (d)

    Tyndall effect

  5. In an electrical field, the particles of a colloidal system move towards cathode. The coagulation of the same sol is studied using K2SO4
    (i), Na3 PO4
    (ii), K4 [Fe(CN)6]
    (iii) and NaCl
    (iv) Their coagulating power should be

    (a)

    II > I > IV > III

    (b)

    III > II > I > IV

    (c)

    I > II > III > IV

    (d)

    none of these

    6. 3 x 2 = 6

  6. Differentiate physisorption and chemisorption.

  7. Which will be adsorbed more readily on the surface of charcoal and why? NH3 or CO2?

  8. In a coagulation experiment 10 mL of a colloid (X) is mixed with distilled water and 0.1M solution of an electrolyte AB so that the volume is 20 mL. It was found that all solutions containing more than 6.6 mL of AB coagulate with in 5 minutes. What is the flocculation values of AB for sol (X)?

    9. 3 x 3 = 9

  9. Peptising agent is added to convert precipitate into colloidal solution. Explain with an example.

  10. What is the difference between a sol and a gel?

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

    12. 3 x 5 = 15

  12. Give three uses of emulsions.

  13. Write a note on electro osmosis.

  14. Explain intermediate compound formation theory of catalysis with an example.

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