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Surface Chemistry

Short Answer Type

91. Why are lyophilic sols self-stabilised?

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92. Sky appears blue in colour. Why?

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93.

Explain the following observations:
(a) Cottrell’s smoke precipitator is fitted at the mouth of the chimney used in factories.
(b) Physical adosption is multi layered, while chemisorption non-tayered.

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94. What causes Brownian movement in a colloidal solution?

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95. Which has a higher enthalpy of adsorption, physisorption or chemisorption?

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96. Describe electrophoresis briefly.

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Long Answer Type

97. Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.

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98. What is the difference between physisorption and chemisorption?

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Short Answer Type

99. Give reason why a finely divided substance is much more effective as an adsorbent.

Answer:
Adsorption is surface phenomenon therefore adsorption is directly proportional to the surface area.
Finely divided substance has greater surface area. Greater is the surface area of the adsorbent, greater would be its absorbent power. That is why a finely divided surface is more effective as an absorbent.

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100. What are the factors which influence the adsorption of a gas on a solid?

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