Explanation:

- Rusting of Iron: This is a classic oxidation process where iron reacts with oxygen to form iron oxide (rust).

- Burning of CO: This also involves oxidation, where carbon monoxide (CO) reacts with oxygen to form carbon dioxide (CO2).

- Zn reacts with HCl: Zinc reacts with hydrochloric acid, releasing hydrogen gas and forming zinc chloride. This is a redox reaction where zinc is oxidized.

- Extraction of Sodium: Sodium is usually extracted via electrolysis of molten sodium chloride. This is a reduction process, not oxidation, as sodium ions gain electrons to form sodium metal.

The reaction that is not oxidation is Extraction of Sodium.

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