Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

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

Solution

E Zn 2+ |Zn o = −0.76  V
E Fe 2+ |Fe o = −0.44  V
Zinc has higher negative electrode potential than iron. So, zinc can be coated on iron to produce galvanized iron but the reverse is not possible.

Asked in: NEET 2016 (Phase 2)

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