Highly electropositive metal(s) can not be commercially extracted by carbon reduction process at high temperature because these :

Options

A. metals combine with carbon to form covalent carbide.
B. metals combine with carbon to form ionic carbide.
C. `Detla G_f` of highly electropositive metal oxide is having low negative value.
D. metal oxides are not reduced by carbon.

Answer

B

Explanation

metals combine with carbon to form ionic carbide.