What is activated charcoal?

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Solution

When the charcoal is strongly heated in absence of air in a closed container, it forms activated charcoal or Activated charcoal is a fine powder that is black in colour and made from coconut shells, wood, or other substances.
It is a form of carbon processed to have low-volume, small pores that increase the surface area available for adsorption. It adsorbs the molecules in its pore structure.
It is very soft and porous and is used in making gas masks to absorb harmful gases.