Asked Apr 10, 2019

Which of the following metals, if coated onto iron, would prevent the corrosion of iron? Explain your reasoning.

(a) Mg                 (b) Cr                (c) Cu


Expert Answer

Step 1

Corrosion of iron (rusting) is a redox process that destroys iron on coming in contact with the oxygen and moisture of the atmosphere. The chemical reaction of rusting is:

Step 2

In rust, iron is present as Fe3+. So, during rusting of Fe, Fe gets converted to Fe3+.

Step 3

One of the methods used for prevention of rusting is coating iron with a more electropositive metal. In this method, a more electropositive metal (i.e. the one with a lower reduction potential) serves the purpose of protecting iron agains...

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