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Explain why iron and aluminium do not ...

Explain why iron and aluminium do not dissolve in conc. `HNO_(3)`

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Iron (Fe) and aluminium (Al) readily dissolve in dilute nitric acid but not in conc. Nitric acid. Because concentrated `HNO_(3)` reacts with Fe and Al and froms a metal oxide layer on the respective metals that protects the bluk of the metal from further oxidation . The formation of this protective layer is called passivation . Hence , Fe and Al do not dissolve in conc. `HNO_(3)`
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