Question
Asked Apr 10, 2019
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Which of the following metals, if coated onto iron, would prevent the corrosion of iron? Explain your reasoning.

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

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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:

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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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