A dilute solution of litmus becomes colourless on shaking with charcoal. This is due to :
Absorption
Adsorption
Chemical reaction
Both A & B
The Colour of the solution is adsorbed on the surface of the charcoal like chalk powder is adsorbed on the duster. This is due to adsorption because it is adsorbing on the surface.
Hence, the correct answer is Option(2)