Q. Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because
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
Explanation
[Solution] Zn ($E^\circ$ = -0.76 V) is more easily oxidised than Fe (-0.44 V), so it protects iron sacrificially. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.