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(A) The correct option is $(A)$.This is an example of cathodic protection or sacrificial protection.$Mg$ has a more negative standard reduction potent

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Is more readily converted into positive ions

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(A) The correct option is $(A)$.This is an example of cathodic protection or sacrificial protection.$Mg$ has a more negative standard reduction potential than $Fe$,meaning it is more reactive and acts as an anode.$Mg$ loses electrons more readily than $Fe$ $(Mg \rightarrow Mg^{2+} + 2e^-)$,thereby preventing the oxidation of iron.

Iron pipes lying under acidic soil are often attached to blocks of magnesium for protection from rusting. Magnesium offers protection to iron against corrosion because it

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