Sky appears blue in colour due to scattering of light by colloidal particles. It is called Tyndall effect.
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What causes Brownian movement in a colloidal solution?
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Long Answer Type
What is the difference between physisorption and chemisorption?
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Short Answer Type
Give reason why a finely divided substance is much more effective as an adsorbent.
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Why are lyophilic sols self-stabilised?
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Long Answer Type
Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.
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Short Answer Type
Which has a higher enthalpy of adsorption, physisorption or chemisorption?
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What are the factors which influence the adsorption of a gas on a solid?
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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.
