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9.2 Nitric Acid — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10Chemistry9.2 Nitric Acid2 Marks
Question
Give reason for the following:
Conc. Nitric acid renders iron passive.
✓

Answer

Concentrated nitric acid renders iron passive because of the formation of extremely thin, unreactive, protective layer of insoluble metallic oxide on the surface which stops further reaction.

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