Question

Which among the following metals is employed to provide cathodic protection to iron?

• A. Nickel
• B. Zinc
• C. Tin
• D. Lead

Answer 1

The correct option is B

Zinc

Explanation for the correct option:

(B) Zinc

• Cathodic protection controls the corrosion of a metal by making the metal as a cathode.
• In the electrochemical series, zinc is below iron and is readily oxidized.
• Zinc has low electric potential and is more reactive than iron.
• Hence, zinc is used for cathodic protection.

Explanation for the incorrect option:

(A) Nickel

• Nickel is less reactive than iron.
• Nickel can't be used for cathodic protection.

(C) Tin

• Iron is more reactive than tin.
• Tin is above iron in the series.

(D): Lead

• Lead is not more reactive than iron.
• Lead lies above iron in the electrochemical series.

Therefore, the correct option is Option(B), Zinc.