Carbon reduction process is not commercially applicable for which of the following set to oxides to extract the respective metal?I. ZnO    II. Fe2O3  III. Al2O3  IV. SnO2   V.  MgO

Carbon reduction process is used to reduce less electropositive metals. Mg and Al have high electropositivity. MgO+C→at high temp.2000ocMg+COIt is possible at high temperatures, so it is not used for commercial purposes.Hence, cannot be extracted from oxides through the carbon reduction process.