What happens when iron is dipped in conc. HNO3?

Answer:

When iron is dipped in conc. HNO3, it becomes chemically inert or passive due to the formation of a layer of iron oxide (Fe3O4) on its surface.

  • Concentrated nitric acid can be used to coat metals like iron, chromium, aluminium, and calcium, forming a protective oxide film that prevents further reactions.
  • When iron is treated with concentrated nitric acid, it becomes passive.

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