Which of the following statement is the only incorrect statement regarding surface phenomenon?

The catalytic reaction of gases in presence of metal catalyst, the reaction must occur through chemisorption.

For the some mole of gas adsorbed at the same solid surface under adiabatic condition, rise in temperature of system will be more in chemisorption than physisorption.

Chemisorption is irreversible because the desorption of any particle from the surface becomes impossible.

Colloids are good adsorbent.