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

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

Option: 1

zinc is lighter than iron


Option: 2

zinc has lower melting point than iron


Option: 3

zinc has lower negative electrode potential than iron


Option: 4

zinc has higher negative electrode potential than iron


Answers (1)

best_answer

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

Iron gets oxidized in presence of moisture which is known as rusting. To protect the iron, it is coated with zinc because zinc has a higher negative reduction potential than iron, so zinc gets oxidized before iron, so it protects the iron from getting oxidized.

\\ \mathrm{E_{Z n^{+2} / Z n}^{o}=-0.76 V} \\\\ \mathrm{ E_{F e^{+} / F e}^{o}=-0.44 V }

Zn has higher negative SRP (Standard reduction potential) so it works as anode and protects iron to make iron as the cathode. So, iron will reduce and zinc will oxidize.

The reverse is not possible because even if the zinc is coated with iron means iron will be in contact with moisture, zinc will get oxidized first due to high negative reduction potential.

Option 4 is correct.

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