Why is adsorption always exothermic ?

The correct statement(s) pertaining to the adsorption of a gas on a solid surface is(are) (i) adsorption is always exothermic (ii) physisorption may transform into chemsisorption transform into chemisorption at high temperature (iii) physisorption increases with increasing temperature but chemisorption decreases with increasing temperature . (iv) chemisorption is more exothermic than physisorption , however it is very slow due to higher energy of activation.

Why all adsorptions are exothermic in nature ?

Adsorption is exothermic. True/False

Assertion :- The graphical representation of physical adsorption with temp is Reason :- This is weak adsorption & adsorption is exothermic process.

Assertion: For Adsorption DeltaG,DeltaH,DeltaS all have -ve values. Reason: Adsorption is a exothermic process in which randomness decreases due to force of attraction between adsorbent and adsorbate.

Why is adsorption accompanied by the decrease of both enthalpy as well as entropy of the system? Which factors help in increasing the extent of physical adsorption of the gas on charcoal powder?

What is an 'adsorption isotherm ? Describe Freundlich adsorption isotherm.

Which one of the following statements is wrong? a. Physical adsorption of gas directly related to its critical temperature. b. Chemical adsorption decreases regularly as the temperature is increased. c. Adsorption is an exothermic process. d. A solid with a rough surface is a better adsorbent than the same solid with a smooth surface.

What is an adsorption isotherm? Describe Freundlich adsorption isotherm.

Physical adsorption is :