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  4. To remove colouring matter from pure substances the activated charcoal is used. It works by

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Q. To remove colouring matter from pure substances the activated charcoal is used. It works by

NTA AbhyasNTA Abhyas 2022

Solution:

It has been observed that the surface of a solid has the tendency to attract and retain the molecules of other immiscible phase with which it is brought into contact. These molecules remain only at the surface and do not go deeper into the bulk. This tendency of accumulation of molecular species at the surface of a solid it termed adsorption.