Surface Chemistry Model Question Paper

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 40
    5 x 1 = 5
  1. For freudlich 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)

    \(\frac{1}{n}\) ,logK

    (d)

    log \(\frac{1}{n}\) ,log K

  2. Which one of the following is correctly matched?

    (a)

    Emulsion - Smoke

    (b)

    Gel - butter

    (c)

    foam - Mist

    (d)

    whipped cream - sol

  3. Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture?

    (a)

    Nitroglycerine

    (b)

    Cellulose acetate

    (c)

    Glycoldinitrate

    (d)

    Nitrocellulose

  4. According to Freundlich adsorption isotherm,

    (a)

    \(\frac { x }{ m } =kp\)

    (b)

    \(\frac { m }{ x } ={ (kp) }^{ \frac { 1 }{ n } }\)

    (c)

    \(\frac { x }{ m } ={ kp }^{ \frac { 1 }{ n } }\)

    (d)

    \(\\ \\ \frac { x }{ m } =\frac { k }{ { p }^{ \frac { 1 }{ n } } } \)

  5. Which of the following interface cannot be obtained?

    (a)

    solid - solid

    (b)

    solid - liquid

    (c)

    gas - gas

    (d)

    liquid -Iiquid

  6. 5 x 2 = 10
  7. Give two important characteristics of physiscorption

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

  9. The mechanism of Fridel crafts reaction is given below
    \({ C }_{ 6 }{ H }_{ 5 }+{ { CH }_{ 3 }Cl\overset { anhydrous\\ \quad \quad \quad { Alcl }_{ 3 } }{ \longrightarrow } }{ C }_{ 6 }{ H }_{ 5 }{ CH }_{ 3 }+HCl\)

  10. When are condensation methods used for the preparation of colloids?

  11. Why are colloids purified?

  12. 5 x 3 = 15
  13. What are enzymes? Write a brief note on the mechanism of enzyme catalysis.

  14. What do you mean by activity and selectivity of catalyst?

  15. Describe some feature of catalysis by Zeolites.

  16. Write a note on Ultrafilteration?

  17. What are the advantages of Brownian movement?

  18. 2 x 5 = 10
  19. What is the difference between homogenous and hetrogenous catalysis?

  20. Describe adsorption theory of catalysis

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