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Surface Chemistry

Short Answer Type

121. What are micelles? Give an example of a micellers system.

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122. Explain the terms with suitable examples:
(i) Alcosol (ii) Aerosol (iii) Hydrosol.

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123. Comment on the statement that “colloid is not a substance a state of substance.”

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124. What are emulsions? Write two applications of emulsification.

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125.

Explain the following term:
(i) Electro-dialysis
(ii) Phases of a colloidal solution.

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126. Taking two examples of heterogeneous catalytic reactions, explain how a heterogeneous catalyst helps in the reaction.

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127.
Explain the following terms with an example of each:
(i) Emulsification,
(ii) Chemisorption.

Answer:

(i) Emulsification. The process of making an emulsion in presence of emulsifying agent is called emulsification e.g., fats are emulsified by bile juice in our body and help in metabolism.

(ii) Chemisorption. When the force of attraction between adsorbent and adsorbate is similar to that of chemical bond it is called chemisorption e.g., N₂ and H₂ get adsorbed on ‘Fe’ in manufacture of NH₃ by Haber’s Process.

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128. What are micelles? How do they differ from ordinary colloid particles? Give two example of micelles forming substances.

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Long Answer Type

129. With the help of suitable diagram, describe the variation in (i) chemisorption (ii) physisorption with changes in temperature and pressure of adsorbed gas. How may these diagram be used to distinguish the two of adsorption?

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