The process of separating different dissolved constituents of a mixture by their adsorption on an appropriate material is called:

Correct answer: (c) chromatography

Explanation

Chromatography separates the dissolved parts of a mixture by how strongly each one is adsorbed on a stationary material, such as paper, a silica column or chalk, while a solvent carries them along.

Parts that hold on less move further, so they separate: for example the dyes in ink or the pigments in a leaf.