Iron is rendered passive by the action of – InterviewSolution

1.	Iron is rendered passive by the action of
Answer» Conc. `H_(2)SO_(4)` Conc. `H_(3)PO_(4)` Conc. `HCl` Conc. `HNO_(3)` Solution :Iron is rendered passive by conc. `HNO_(3)` and other OXIDIZING agents like `K_(2)Cr_(2)O_7),KMnO_(4),` CHLORIC acid, CHROMIC acid, silver nitrate etc. A specimen of passive iron can be rendered active by scratching the film mechanically or chemically.

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