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Explain what is observed
(i) when a beam of light is passed through a colloidal sol.
(ii) an electrolyte, NaCl is added to hydrated ferric oxide sol.
(iii) electric current is passed through a colloidal sol?

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Short Answer Type

112. What are emulsions ? What are their different types? Give example of each type.

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113. What is de-emulsification ? Name two demulsifiers.

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Long Answer Type

114. Action of soap is due to emulsification and micelle formation. Comment.

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115. Give four examples of heterogeneous catalysis.

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116. What do you mean by activity and selectivity of catalysts?

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Short Answer Type

117. Describe some features of catalysis by zeolites.

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118. What is shape selective catalysis?

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Long Answer Type

119. Explain the following terms: (i) Electrophoresis (ii) Coagulation (iv) Dialysis (iv) Tyndall effect.

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120. Give four uses of emulsions.

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