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 Multiple Choice QuestionsLong Answer Type

101. What is an adsorption isotherm ? Describe Freundlich adsorption isotherm.
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 Multiple Choice QuestionsShort Answer Type

102. What do you understand by activation of adsorbent? How is it achieved?
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103. What role does adsorption play in heterogeneous catalysis?
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104. Why is adsorption always exothermic?
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 Multiple Choice QuestionsLong Answer Type

105. How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium? 
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106. Discuss the effect of pressure and temperature on the adsorption of gases on solids. 
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107. What are lyophilic and lyophobic sols? Give one example of each type. Why are hydrophobic sols easily coagulated?


Answer:
On the basis of attraction between dispersed phase and dispersion medium colloids may be classified into lyophillic sol and lyophobic sol.

If dispersed phase (solid) tends to attract (i.e., like or love) dispersion medium (liquid), the resultant sol is termed as lyophilic sol. Examples are: Sol of gum, gelatine, starch etc. are lyophilic sols.

On the other hand if dispersed phase tends to repel (i.e., dislike or hatred) dispersion medium, the resultant sol is termed as lyophobic sol. Examples are: Sols of metals, metal hydroxides, metal sulphides etc. are lyophobic sols.

Hydrophobic sols easily coagulated as in this dispersion medium has no apparent affinity or interaction with the dispersed phase.

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108. What is the difference between multimolecular and macromolecular colloids? Give one example of each. How are these two types of colloids different from these two types of colloids? 
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109. What are enzymes? Write in brief the mechanism of enzyme catalysis.
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110. How are colloids classified on the basis of
(i) physical states of components
(ii) nature of dispersed phase and
(iii) interaction between dispersed phase and dispersion medium?
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