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Iron is rendered passive by the action o...

Iron is rendered passive by the action of

A

Conc. `H_2SO_4`

B

Conc. `H_3PO_4`

C

Conc. `HCl`

D

Conc. `HNO_3`

Text Solution

Verified by Experts

The correct Answer is:
D
Iron is rendered passive by conc. `HNO_3` and other oxidizing agents like `K_2Cr_2O_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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