Identify physisorption from the following.

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(D) Physisorption (physical adsorption) is characterized by weak van der Waals forces between the adsorbate and the adsorbent. It is non-specific in n

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All gases deposited on charcoal

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(D) Physisorption (physical adsorption) is characterized by weak van der Waals forces between the adsorbate and the adsorbent. It is non-specific in nature. Chemisorption involves strong chemical bonds and is highly specific. $O_2$ on tungsten,$H_2$ on nickel,and $N_2$ on iron involve chemical bond formation (chemisorption). Adsorption of gases on charcoal is a classic example of physisorption due to weak van der Waals forces.

Gas	Critical temperature $(K)$
$He$	$5.2$
$CH_{4}$	$190$
$CO_{2}$	$304.2$
$NH_{3}$	$405.5$

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Gas Critical temperature $(K)$

$He$ $5.2$

$CH_{4}$ $190$

$CO_{2}$ $304.2$

$NH_{3}$ $405.5$

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The following graph is obtained for physisorption of a gas as a function of pressure at different temperatures. The correct order of the temperatures is:

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