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(N/A) Physical adsorption (Physisorption)Chemical adsorption (Chemisorption)$1$. It arises due to weak van der Waals forces.$1$. It is caused by stron

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(N/A) Physical adsorption (Physisorption)Chemical adsorption (Chemisorption)$1$. It arises due to weak van der Waals forces.$1$. It is caused by strong chemical bond formation.$2$. It is not specific in nature.$2$. It is highly specific in nature.$3$. It is reversible in nature.$3$. It is irreversible in nature.$4$. It depends on the nature of gas; easily liquefiable gases are adsorbed readily.$4$. It depends on the nature of gas; gases that react with the adsorbent show chemisorption.$5$. Enthalpy of adsorption is low $(20-40 \ kJ \ mol^{-1})$.$5$. Enthalpy of adsorption is high $(80-240 \ kJ \ mol^{-1})$.$6$. Low temperature is favourable; it decreases with an increase in temperature.$6$. High temperature is often favourable; it increases with an increase in temperature.$7$. No appreciable activation energy is needed.$7$. High activation energy is often required.$8$. It depends on the surface area; it increases with an increase in surface area.$8$. It also increases with an increase in surface area.$9$. It results in multimolecular layers on the adsorbent surface.$9$. It results in a unimolecular layer.

Give the differences between physical adsorption and chemical adsorption.

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Physical adsorption (Physisorption)	Chemical adsorption (Chemisorption)
$1$. It arises due to weak van der Waals forces.	$1$. It is caused by strong chemical bond formation.
$2$. It is not specific in nature.	$2$. It is highly specific in nature.
$3$. It is reversible in nature.	$3$. It is irreversible in nature.
$4$. It depends on the nature of gas; easily liquefiable gases are adsorbed readily.	$4$. It depends on the nature of gas; gases that react with the adsorbent show chemisorption.
$5$. Enthalpy of adsorption is low $(20-40 \ kJ \ mol^{-1})$.	$5$. Enthalpy of adsorption is high $(80-240 \ kJ \ mol^{-1})$.
$6$. Low temperature is favourable; it decreases with an increase in temperature.	$6$. High temperature is often favourable; it increases with an increase in temperature.
$7$. No appreciable activation energy is needed.	$7$. High activation energy is often required.
$8$. It depends on the surface area; it increases with an increase in surface area.	$8$. It also increases with an increase in surface area.
$9$. It results in multimolecular layers on the adsorbent surface.	$9$. It results in a unimolecular layer.