a) Write any two differences between physisorption and chemisorption.
b) Name the phenomenon/effect for the following:
i) Colloidal particles are in zig-zag motion.
ii) When an electrical potential is applied across two platinum electrodes dipping in a colloidal solution, particles move towards one or the other electrodes.
iii) Scattering of light by colloidal solution.

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Solution

a)
Physisorption Chemisorption
It involves physical forces (van der Waals forces) between the particles of adsorbate and adsorbent.
It involves chemical bonds (covalent bonds) between the particles of adsorbate and adsorbent.
It is not specific in nature. It may be found in all instances.
It is highly specific in nature. It occurs only if there is tendency to form a chemical bond.
b)
i) Colloidal particles are in zig-zag motion.
Brownian movement
ii) When an electrical potential is applied across two platinum electrodes dipping in a colloidal solution, particles move towards one or the other electrodes.
Electrophoresis:
iii) Scattering of light by colloidal solution.
Tyndal effect:

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Physisorption	Chemisorption
It involves physical forces (van der Waals forces) between the particles of adsorbate and adsorbent.	It involves chemical bonds (covalent bonds) between the particles of adsorbate and adsorbent.
It is not specific in nature. It may be found in all instances.	It is highly specific in nature. It occurs only if there is tendency to form a chemical bond.