Consider the following statements about Langmuir isotherm. I. The free gas and adsorbed gas are in dynamic equilibrium. II. All adsorption sites are equivalent. III. The initially adsorbed layer can act as a substrate for further adsorption. IV. The ability of a molecule to get adsorbed at a given site is independent of the occupation of neighboring sites. The correct statements are

Step-by-step solution

Langmuir isotherm gives the relationship between the release of adsorbed gas and pressure. The Langmuir isotherm assumes that the gas attaches to the surface of adsorbent. The free gas and adsorbed gas are in dynamic equilibrium. The surface of the adsorbent is uniform that is, all the adsorption sites are equivalent. The ability of a molecule to get adsorbed at a given site is independent of the occupation of neighbouring sites. Thus, statements I ,   II and IV are correct.