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Question

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


A

Nickel

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B

Zinc

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C

Tin

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D

Lead

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Solution

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.


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