Identify the correct statement.

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(C) Corrosion of iron is an electrochemical process that requires both oxygen and moisture. It can be prevented or minimized by creating an impermeabl

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Corrosion of iron can be minimized by forming an impermeable barrier at its surface.

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(C) Corrosion of iron is an electrochemical process that requires both oxygen and moisture. It can be prevented or minimized by creating an impermeable barrier (like paint or galvanization) on the surface of the iron to prevent contact with air and moisture. Option $A$ is incorrect because iron should be in contact with a metal having a lower reduction potential (like $Zn$) for cathodic protection. Option $B$ is incorrect as iron does not corrode significantly in oxygen-free water. Option $D$ is incorrect because salt water acts as an electrolyte,increasing the conductivity and rate of the electrochemical reaction,not because the potential of iron changes.

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