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1074

Q: In addition to nitric acid, another acid which may render iron passive is

  • 1
    acetic acid
  • 2
    oxalic acid
  • 3
    chromic acid
  • 4
    citric acid
  • Show Answer
  • Workspace

Answer : 3. "chromic acid"
Explanation :

Answer: C) chromic acid Explanation: Passivity of iron is due to formation of an extremely thin and impervious film of ferrosoferric oxide Fe3O4on the surface of iron. Chromic acid, being a powerful oxidising agent (like nitric acid ) renders iron passive.

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