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CSS Solved Papers
Physics Chemistry

Engineering :: Materials of Construction


  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]. is lighter than air[B]. is more readily converted into positive irons
[C]. prevents air from reaching the surface of iron[D]. forms a corrosion-resistant alloy with iron

Answer: Option B


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