Question

A certain metal has high concentration in the Earth's crust and its oxides cannot be reduced by carbon. Which is the most suitable method for the extraction of such a metal?

• A. Alumino thermite process
• B. Electrolysis process
• C. Van-Arkel's process
• D. Cupellation

Answer 1

The correct option is B Electrolysis process

Oxides of strong electropositive metals such as $K,Ca,Na,Al$ and $Mg$ are very stable. It is difficult to reduce them into metallic state by carbon reduction. Such metals are extracted by passing electricity (electrolysis process) through their fused chlorides/oxides/hydroxides.

Hence, the most suitable method for extraction of a metal which has high concentration in the Earth's crust and whose oxides cannot be reduced by carbon is electrolysis process.