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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.

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

Answer:
The factors which influence the adsorption of a gas on a solid are:
(1) The nature of a gas adsorbate and nature of solid adsorbent.
(2) Surface area of adsorbent.
(3) Pressure of gas.
(4) Temperature.
(5) Activation of adsorbent.

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