(i) adsorption of coloured substance

(ii) adsorption of solvent

(iii) absorption and adsorption both of solvent

(iv) absorption of solvent

Correct Answers:

(i) adsorption of coloured substance

(iv) absorption of solvent

Explanation: The adsorption of the coloured substance and the absorption of the solvent present in the ink occurs when a chalk stick is dipped in ink.