#### 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