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Which of the following is correct about the adsorption of $\mathrm{N}_{2}$ over Iron?
Option: 1
It is always physically adsorbed

Option: 2
Extent of adsorption over iron decreases with the increase in temperature first and then increases

Option: 3
It is always chemically adsorbed

Option: 4
$\mathrm{N}_{2}$ is never adsorbed over iron

Answers (1)

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Adsorption of $\mathrm{N}_{2}$ over iron is an example of chemisorption.

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