Assertion :Langmuir adsorption is a single-layer phenomenon. Reason: It is due to van der Waals forces.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Adsorption isotherm is the variation of adsorption with pressure. it depicts a relationship between the number of active sites of the surface undergoing adsorption and pressure.
All the vacant sites are of equal size and shape on the surface of adsorbent.
Each site can hold maximum of one gaseous molecule and a constant amount of heat energy is released during this process.

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