The technique used for the molecule separation on the basis of differential adsorption is

Chromatography is a method of separating and identifying the components of a complex mixture by differential movement through a two-phase system, in which the movement is effected by a flow of a liquid or a gas (which acts as a mobile phase) which percolates through an adsorbent (which acts as a stationary phase) or a second liquid phase. So, chromatography is a method for separating the components of a mixture by differential adsorption between a stationary phase and a mobile phase

So, the correct answer is 'Chromatography'