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Q.

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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a

Prevents air from reaching the surface of iron

b

is more readily converted into positive ions

c

is higher than iron

d

Forms a corrosion-resistance alloy with iron

answer is B.

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Detailed Solution

Due to electropositive and reactive in nature, magnesium is readily converted into positive ions on contact with iron pipes and, hence, iron pipes remains as it is.
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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