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Iron is rendered passive by treatment wi...

Iron is rendered passive by treatment with

A

HCl

B

`H_(2)SO_(4)`

C

`H_(3)PO_(4)`

D

`HNO_(3)`

Text Solution

Verified by Experts

The correct Answer is:
D
Conc. `HNO_(3)` renders iron passive by forming a thin protective film of `Fe_(3)O_(4)` on its surface.
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