Why catalyst are required in very small non-stoichiometric quanti
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    Surface Chemistry

    Multiple Choice QuestionsShort 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?

    Answer:
    Catalyst only alter the reaction thus 
    Catalysts are required in very small non-stoichiometric quantities because they are not consumed during the reaction.
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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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