CBSE Class 12 · 2002 · All India · Redox Reactions and ElectrochemistryVery Short Answer

Which type of metal can be used in cathodic protection of iron against rusting?

Answer: A metal more reactive (more electropositive) than iron, e.g. magnesium or zinc.

Solution

A metal more reactive than iron — one with a more negative electrode potential, such as magnesium or zinc — is used; it acts as the sacrificial anode while iron stays protected as the cathode.

CBSE Class 12 Board · 2002 · All India · Subjective

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