Question

. In what condition extraction of Mg is possible by MgO using carbon reduction method.

Answer 1

According to Ellingham diagram reduction of metal oxide with carbon will occur when the accompanying G
is negative. Such reduction become progressively more feaxible the higher the temperature. MgO can only
be reduced by carbon at the temperature approximate 2000°C.
Mg was formely by heating MgO and C to 2000°C, at which temperature C reduces MgO. The gaseous
mixture of Mg and CO was then cooled very rapidly to deposit the metal. This 'quenching' or 'shockcooling'
was necessary as the reaction is reversible, and if cooled slowly the reaction will come to equilibrium further
to the left.
Mg+ + C   Mg+ CO

Answer 2

Mg+ + C give Mg+ + Co