Question

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

Answer 1

Answer: (D)

zinc has higher negative electrode potential than iron

Answer 2

${E^{0}_{Zn^{+2}/Zn} = - 0.76 \; V}$
${E^{0}_{Fe^{+2} /Fe} = - 0.76 \; V}$
Zn has higher negative SRP (Standard reduction potential) so it works as anode and protect iron to make iron as cathode.