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Question

The Langmuir adsorption isotherm is deduced using the assumption

A
The adsorbed molecules interact with each other.
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B
The adsorption takes place in multilayers.
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C
The adsorption sites are equivalent in their ability to adsorb the particles.
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D
The heat of adsorption varies with coverage.
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Solution

The correct option is C The adsorption sites are equivalent in their ability to adsorb the particles.
If you remember, we have talked about 3 assumptions that Langmuir made to derive his theory of adsorption.
They are :
1. Every adsorption site is equivalent
2. The ability of a particle to bind on the site is independent of whether or not nearby sites are occupied.
3. The adsorption forms only a uni-molecular layer
We can see that option c is one of the assumptions and the others are not.

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