Which of the following factors affect the adsorption of a gas on solid?

T_{c}

(critical temp.)

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Temperature of gas

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Pressure of gas

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All of them

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Solution

The correct option is D All of them
The amount of adsorption decreases with the increase of temperature and increases with the increase of pressure.
The critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied, no matter how much pressure is applied. So higher the critical temperature of a gas, higher is the extent of adsorption. But a gas having non polar molecule have weak forces for bonding than ionic molecule so it will adsorb less.

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III : At the critical point in the Van der Walls gas isotherm.

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