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Surface Chemistry

Short Answer Type

21. What are homogeneous and heterogeneous catalysts?

Answer:
When the reactants and the catalyst are in the same phase (i.e., liquid or gas), the process is said to be homogeneous catalysis.

2 S O_{2} (g) + O_{2} (g) \overset{N O (g)}{\to} 2 S O_{3} (g)

The catalytic process in which the reactants and the catalyst are in different phases is known as heterogeneous.

$2 S O_{2} (g) \overset{P t (s)}{\to} 2 S O_{3} (g)$

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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?

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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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