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Question

Metals can be prevented from rusting by:

A
connecting iron to more electropositive metal cathodic protection
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B
connecting iron to more electropositive metal anodic protection
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C
connecting iron to less electropositive metal anodic protection
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D
connecting iron to less electropositive metal cathodic protection
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Solution

The correct option is A connecting iron to more electropositive metal cathodic protection
Connecting the steel pipe to a more active metal like magnesium makes an iron-magnesium voltaic cell which oxidizes the magnesium in preference to the iron. Replacing the magnesium rod is easier than digging up the pipe.

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