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 Multiple Choice QuestionsShort 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.” 


Answer:

The nature of the substance whether colloid or crystalloid depends upon the particle size. When the size of the solute particles lies between 1000-10000 pm, it behaves like a colloid and in case it is less than this value, it gives the characteristics of crystalloid. Thus, colloid is not a substance but it is state of a substance which depends upon the particle size.
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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.

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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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 Multiple Choice QuestionsLong 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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 Multiple Choice QuestionsShort Answer Type

130. Adsorption of a gas on the surface of solid is generally accompanied by decrease in entropy. Still it is a spontaneous process. Explain.
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