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Question

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because
  1. zinc has lower negative electrode potential than iron
  2. zinc has higher negative electrode potential than iron
  3. zinc is lighter than iron
  4. zinc has lower melting point than iron


Solution

The correct option is A zinc has lower negative electrode potential than iron
Zn and Fe both have a low tendency to get reduced. That is why the two have negative potential values (Assumed as reduction potential by standard).

But between the two, the one having a lower negative potential has a relatively higher tendency to get reduced.

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