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

Options

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

Answer

D

Explanation

Zinc has higher negative electrode potential than iron
Hint : `E_(Zn^(+)|Zn)^(@)=-0.76V and E_(Fe^(2+)|Fe)^(@)=-0.44V`. Zinc has higher negative electrode potential than iron, iron cannot be coated on zinc.