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Study of Compounds - Nitric Acid — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryStudy of Compounds - Nitric Acid3 Marks
Question
What is passive iron? How is passivity removed?
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Answer

Iron becomes inert when reacted with nitric acid due to the formation of extremely thin layer of insoluble metallic oxide which stops the reaction.
Passivity can be removed by rubbing the surface layer with the sand paper or by treating with strong reducing agent.

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