Question

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
a) Prevents air from reaching the surface of iron
b) is more readily converted into positive ions
c) forms a corrosion resistive alloy with iron

Answer 1

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.
Solution:(b)