A) prevents air from reaching the surface of iron
B) is more readily converted into positive ions
C) is heavier than iron
D) forms a corrosion-resistant alloy with iron
Correct Answer: B
Solution :
During corrosion iron is converted into cation and is wasted. Magnesium is more electropositive and reactive than iron. When magnesium is attached to iron pipes, because of its more reactive nature, it is converted into cation and iron pipes remain as it is.
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