Question

When a chalk stick is dipped in ink, then
(A) the colored pigments in the ink get absorbed in the chalk.
(B) the solvent gets adsorbed at the surface of chalk.
(C) inside of the chalk will remain as white while the surface will have colored pigments.
(D) inside of the chalk will have colored pigments while the surface will remain white.

Answer 1

Adsorption is the grip of ions, particles, or atoms from a gas, fluid, or disintegrated strong to a surface. This cycle makes a film of the adsorbate on the outside of the adsorbent. They are of two kinds: Physisorption and Chemisorption, e.g., oxygen particles (red) adsorbed on a bimetallic surface of platinum (purple) and cobalt (green).

Complete Step By Step Solution:
ADSORBATE
A material that has been or is fit for being adsorbed is known as adsorbate.
e.g Oxygen atom adsorbed on cobalt. Here oxygen is absorbed.
ADSORBENT
The substance on which adsorbate is adsorbed is called adsorbent. Significant sorts of adsorbents being used are: enacted alumina, silica gel, initiated carbon, subatomic strainer carbon, sub-atomic sifter zeolites and polymeric adsorbents. Most adsorbents are fabricated, (for example, enacted carbons), however a couple, for example, a few zeolites, happen normally.
At the point when a chalk stick is dunked in ink, the surface holds the shade of the ink because of the ingestion of hued particles while dissolvable of ink goes further into the stick because of adsorption, yet the shading is available just on a superficial level, in this way, within the stick stays white.

Additional Information:
Component OF ADSORPTION
Adsorption happens when the surface particles of the adsorbent experience the unequal appealing powers from the mass, however on a superficial level the particles are not encircled by iotas or atoms from all sides. Consequently, they have uneven alluring powers. These powers of the adsorbent are answerable for pulling in the adsorbate particles on its surface. Adsorption increment with increment in surface zone per unit mass of the adsorbent at a given temperature and weight.

Note:
At the point when a gas is adsorbed on the outside of a strong by the feeble intermolecular powers of fascination (van der waals powers) without the arrangement of any compound connection between the adsorbate and the adsorbent, it is called actual adsorption. At the point when the power of fascination existing among adsorbate and adsorbent are substance powers of fascination or compound bond, the cycle is called Chemical adsorption or chemisorption.