Electrochemistry — Chemistry STD 12 Science — Question

3. Electrochemical change.

Explanation:

Hint: Corrosion is the oxidation of metal by moist air, often unwanted.

Corrosion is an electrochemical change. A highly reactive metal (easily oxidisable) is oxidised in the anodic reaction M^x++ xe⁻ → M. Highly reactive metals are more easily corroded unless they form a protective oxide layer around them on oxidation which prevents further oxidation. Noble metals like Pt are not easily corroded.