Question

Which of the following phenomenon occurs when a chalk stick is dipped in ink \[?\]
(This question has multiple correct options)
A.Adsorption of coloured substance
B.Adsorption of solvent
C.Absorption and adsorption both of solvent
D.Absorption of solvent

Answer 1

Hint: Adsorption is the process of adhesion (a functional manner by surface attachment that resists separation) of molecules of liquid or gases onto the surface of a solid particle. Adsorption is a surface phenomenon where the molecules simply attach to the surface of the adsorbent. Absorption is a bulk phenomenon where molecules of adsorbate enter into the absorbent.

Complete answer: A solvent is a substance that dissolves a solute, resulting in a solution. A solvent is usually a liquid but can also be a solid, a gas, or a supercritical fluid.
When a chalk stick is dipped in ink, the surface retains the colour of the ink due to adsorption of coloured molecules while the solvent of the ink goes deeper into the stick due to absorption.
Hence, correct options are (A ) and (D).

Note:
Note that the main difference between absorption and adsorption is that absorption is the process in which a fluid dissolves by a liquid or a solid. In the case of Adsorption, the atoms, ions, or molecules from a substance adhere to a surface of the adsorbent. Also, a Chalk is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite.