'Adsorption' principle is used for which of the following purification method?

The principle of 'Adsorption' is used in the purification method known as 'Activated Carbon Filtration'.

Here are the steps explaining how it works:

1. Contaminated water or air is passed through a filter containing activated carbon.
2. The activated carbon has a large surface area due to its porous structure. This allows it to adsorb a large amount of contaminants.
3. The contaminants stick to the surface of the activated carbon, a process known as adsorption.
4. The now purified water or air is then collected on the other side of the filter.

This method is commonly used to remove organic compounds, chlorine, and other contaminants from water and air.