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The corrosion rate of most metals passes through a maximum with rising pH at

  • A.low pH, falling as the solution becomes alkaline
  • B.high pH, falling as the solution becomes acidic
  • C.exactly pH 7, falling on both sides
  • D.a value independent of the metal concerned

Answer: A

In acid the hydrogen evolution route is available and any protective film dissolves, while in alkaline solution iron passivates. Amphoteric metals such as aluminium and zinc are the exception, being attacked at both extremes.

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