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  4. Which plot is the adsorption isobar for chemisorption where x is the amount of gas adsorbed on mass ‘m’ (at constant pressure) at temperature T?

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Q. Which plot is the adsorption isobar for chemisorption where $x$ is the amount of gas adsorbed on mass ‘$m$’ (at constant pressure) at temperature $T$?

Surface Chemistry

Solution:

Adsorption isobar is a graph between the amount adsorbed $(x/m)$ and the temperature $(T)$ of the adsorbate at constant pressure.
The chemisorption isobar shows an initial increase in $(x/m)$ with temperature and then expected decrease, which is because of the heat supplied, acts as activation energy.