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Surface Chemistry Model Question Paper

12th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 40
    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 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 physisorption.

  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
    \({ C }_{ 6 }{ H }_{ 5 }+{ { CH }_{ 3 }Cl\overset { anhydrous\\ \quad { Alcl }_{ 3 } }{ \longrightarrow } }{ C }_{ 6 }{ H }_{ 5 }{ CH }_{ 3 }+HCl\)

  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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