Question

why aluminium cannot be extracted by using carbon as a reducing agent

Answer 1

The bond between aluminium and oxygen is stronger than the bond between carbon and oxygen, which is stronger than the bond between iron and oxygen. 

That's putting it in very informal language. Posh language would talk about free energies of formation, but that would come to the same thing really. Another way of putting it: carbon is not a strong enough reducing agent to reduce aluminium oxide to aluminium metal. As the other answer says, this needs to be done electrochemically.

Answer 2

hlo mateee.

here is ur ans

aluminium can't be extracted by using carbon ,

because , since aluminium itself is highly electropositive element hence carbon cant be used , but it can be extracted by using electrolysis procedure