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Question:

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

zinc is lighter than iron

zinc has lower melting point than iron

zinc has lower negative electrode potential than iron

zinc has higher negative electrode potential than iron

Solution:

E0Zn2+|Zn= –0.76 VE0Fe2+|Fe= –0.44 VZn 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.