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

Options

A. Is more readily converted into positive ions
B. Is lighter than iron
C. Forms a corrosion-resistant alloy with iron
D. Prevents air from reaching the surface of iron

Answer

A

Explanation

Electric protection : In this Mg acts as anode while iron pipe as cathode. Mg looses electrons prior to iron.