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Corrosion of iron proceeds faster in a solution of sodium chloride than in pure water because the chloride

  • A.reduces the dissolved oxygen concentration
  • B.makes the solution strongly alkaline
  • C.forms an adherent protective layer on the metal
  • D.raises the conductivity and breaks down films

Answer: D

A more conductive electrolyte lets the corrosion current flow more easily between anode and cathode, and chloride ions penetrate and destabilise the oxide film. It is why marine and de-iced-road environments are so much more aggressive.

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