First slide

Corrosion

Question

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

Moderate

A

zinc is lighter than iron
B

zinc has lower melting point than iron
C

zinc has lower negative electrode potential than iron
D

zinc has higher negative electrode potential than iron

Solution

Reduction potential values of
$E_{{Zn}^{2 +} / Zn} ° = - 0.76 V and E_{{Fe}^{2 +} / Fe} ° = - 0.44 V$
Thus, due to higher negative electrode potential value of zinc than iron, iron cannot be coated on zinc.

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