Which pair of metals can be obtained through electrolysis?

Electrolysis is a method used to extract metals from their ores, particularly for metals that are more reactive and cannot be obtained through traditional methods like reduction with carbon. Sodium and calcium are both alkali metals, which are located in Group 1 of the periodic table. Due to their high reactivity, these metals can be extracted from their molten salts through the process of electrolysis.

During electrolysis, an electric current is passed through the molten ionic compound, causing it to break down into its constituent elements. For sodium, molten sodium chloride (table salt) can be electrolyzed to produce sodium metal and chlorine gas. Similarly, calcium can be obtained by electrolyzing molten calcium chloride. This process is effective for highly reactive metals that cannot be reduced easily by carbon or other methods.

The other pairs consist of metals that can either be obtained through less energy-intensive processes or do not require electrolysis for extraction. Gold and platinum are noble metals that are found in their native state and typically require no extraction from ores. Zinc and tin can often be obtained through smelting rather than electrolysis, and iron and lead, while they can be extracted through electrolysis under specific conditions, are more commonly extracted through traditional smelting techniques. Thus, sodium and calcium