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Iron is rendered passive by treatment wi...

Iron is rendered passive by treatment with concentrated

A

`H_2SO_4`

B

`H_3PO_4`

C

`HCl`

D

`HNO_3`

Text Solution

Verified by Experts

The correct Answer is:
D
The inertness exhibited by metals under conditions in which chemical activity is expected is known as passivity. The phenomenon of passivity is explained by assuming the formaion of a thin film of oxide on the surface of the metal which prevents the action of the reagent. The concentrated nitric acid makes metals such as `Fe,Co,Ni,Cr,Al`. etc., passive.
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