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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?

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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.

Answer:

As adsorption is exothermic. it leads to a decrease in the residual force on the surface of the adsorbent. This cause a decrease in the surface energy of the adsorbent. When gas is adsorbed on the surface of solid entropy decrease, i.e., ΔS = –ve. Since ΔH = –ve, ΔS= –ve, for adsorption to be spontaneous AG must be negative [ΔG = ΔH – TΔS].

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