Question

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

• A. zinc has lower negative electrode potential than iron
• B. zinc has higher negative electrode potential than iron
• C. zinc is lighter than iron
• D. zinc has lower melting point than iron

Answer 1

The correct option is B zinc has higher negative electrode potential than iron

$E_{Z{n}^{2+}|Zn}^0=–0.76V$
$E_{F{e}^{2+}|Fe}^0=–0.44V$
Zn has higher negative SRP (Standard reduction potential) so it works as anode and protects iron to make iron as the cathode.
Hence, option $B$ is correct.