Question

Which metal is extracted by electrolysis?

• A. Iron
• B. Zinc
• C. Sodium
• D. Copper

Hint:

Carbon is like a "thief" that can only steal oxygen from less powerful (less reactive) metals. Since Sodium is much more reactive than Carbon, the only way to separate it is using the "brute force" of electricity.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The method of extracting a metal from its ore depends on its position in the reactivity series. Highly reactive metals cannot be reduced by carbon or carbon monoxide and require electrolysis.

Step 2: Detailed Explanation:

• High Reactivity (Na, K, Ca, Mg, Al): These metals are extracted by the electrolysis of their molten chlorides or oxides. For example, Sodium is extracted via the Downs Process.
• Medium Reactivity (Zn, Fe, Pb): These are usually extracted by reducing their oxides with carbon (coke) in a furnace.
• Low Reactivity (Cu, Hg): These can often be extracted by simply heating their ores in air (roasting) or through displacement.

Step 3: Final Answer:
Sodium is the metal extracted by electrolysis.