Question:
Identify from the following the phenomenon that occurs when charcoal is added to methylene blue solution and shaken, it becomes colourless after some time.
Identify from the following the phenomenon that occurs when charcoal is added to methylene blue solution and shaken, it becomes colourless after some time.
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Accumulation of a substance on the surface of a solid, and not in its bulk, is called adsorption.
Updated On: Nov 12, 2026
- Desorption
- Sorption
- Adsorption
- Absorption
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Activated charcoal has a very large, porous surface.
Step 2: What happens
On shaking, methylene blue molecules collect and stay only on the surface of the charcoal. They do not spread through its bulk.
Step 3: Result
Accumulation of a substance at a surface, rather than in the interior, is adsorption. This removes the dye and the solution becomes colourless.
Final Answer:
The phenomenon is adsorption. \[ \boxed{\text{(C) }\text{Adsorption}} \]
Activated charcoal has a very large, porous surface.
Step 2: What happens
On shaking, methylene blue molecules collect and stay only on the surface of the charcoal. They do not spread through its bulk.
Step 3: Result
Accumulation of a substance at a surface, rather than in the interior, is adsorption. This removes the dye and the solution becomes colourless.
Final Answer:
The phenomenon is adsorption. \[ \boxed{\text{(C) }\text{Adsorption}} \]
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