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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.

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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?

If space straight x over straight m left parenthesis extent space of space adsorption right parenthesis

first increases and then decreases with increase in temperature it is chemical adsorption. If it decreases with increase in temperature, it is physical adsorption.
If

straight x over straight m

increases with increase in pressure, it is physical adsorption. If it first increases and then becomes independent of pressure then it is chemical adsorption.
first increases and then decreases with increase in temperature it is

first increases and then decreases with increase in temperature it is

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Short 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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