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Surface Chemistry

Short Answer Type

21. What are homogeneous and heterogeneous catalysts?

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22. What are Zeolites?

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23. Write the Freundlich adsorption isotherm for the adsorption from solution.

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24. Give the Langmuir adsorption isotherm expression for the adsorption from solutions.

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25. Why catalyst are required in very small non-stoichiometric quantities?

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26. What are enzymes?

Answer:

Enzymes are biological catalysts which increase the rate of cellular reactions.
Example

Inversion of cane sugar: The invertase enzyme converts cane sugar into glucose and fructose
$C_{12} H_{22} O_{11} (Aq) + H_{2} O (l) \overset{Invertase}{\to} C_{6} H_{12} O_{6} (aq) + C_{6} H_{12} O_{6} (aq) Cane sugar Glucose Fructose$

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27. Name some solid catalysts.

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28. What is meant by the term ‘peptization’?

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29. How does BF₃ act as a catalyst in industrial process?

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30. What happens when an electric field is applied to a colloidal dispersion?

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