Adsorption and Colloids — Chemistry STD 11 Science — Question
Maharashtra BoardEnglish MediumSTD 11 ScienceChemistryAdsorption and Colloids4 Marks
Question
Explain the phenomenon of adsorption with the help of examples.
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Answer
Consider the following two examples:
Example $1:$ When a metal spoon is dipped in milk and taken out, it is observed that a film of milk particles covers the spoon surface.
Example $2:$ If a cold water bottle is taken out from the refrigerator and kept on a table for a while, water vapour is seen to condense on the outer surface of the bottle, forming droplets or a film.
In the above examples, the milk particles or the water molecules from the air get adsorbed on the surface of the spoon and the bottle, respectively.
Similarly, surfaces of many objects around us are exposed to the atmosphere. Water molecules as well as other gas molecules such as $N_2, O_2,$ from the air form an invisible multimolecular film on these objects.
This is known as the phenomenon of adsorption.
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