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A cathodic inhibitor for a neutral aerated water may act by

  • A.increasing the water's conductivity
  • B.lowering the water's pH to the acid range
  • C.removing the dissolved oxygen
  • D.filming over the anodic sites

Answer: C

Sodium sulphite or hydrazine deprives the cathodic reaction of its electron acceptor and the whole process stops for want of it. In acid solutions organic amines and thiourea instead raise the hydrogen overvoltage at the cathode.

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