Question

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

• A. metal combine with carbon to form covalent carbide
• B. metal combine with carbon to form ionic carbide
• C. $G_f$ of highly electropositive metal oxide is having low negative value
• D. Consider the following reaction at ${1000}^{0}C$

Answer 1

The correct option is B metal combine with carbon to form ionic carbide

As they are highly electropositive metals, high purity metal is obtained at cathode. They are not extracted through carbon reduction because they aren't reduced. It they are reduced also, They have impurities.

The metal combines with carbon to form ionic carbide