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    Surface Chemistry

    Multiple Choice QuestionsShort Answer Type

    31. Give an example of an associated colloid.
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    32.
    Mention an application of emulsions.
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    33. How can the Freundlich adsorption isotherm be represented when the value of n is less than one?
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    34. Why is a catalyst, in general in the form of finely divided powder?
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    35. How does the emulsification of fats take place in the intestines?

    Answer:

    Digestion of fats in the intestines is aided by emulsification. A small quantity of the fat forms sodium soap with the alkaline solution of the intestine and this soap emulsifies the rest of the fat.
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    36. Which colloidal system is represented by butter?
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    37. Why do colloidal solution exhibit Tyndall effect?
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    38. State any one characteristic of enzymatic catalysis.
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    39. What is the cause of Brownian movement observed in colloidal solutions?
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    40. What is the sign of ΔH and ΔS when bromine gas gets absorbed on charcoal?
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