Published by:
CGP EDU Academic Team
Published on: August 11, 2026
Iron is rendered passive by the action of
A
Conc. 
B
Conc. 
C
Conc. 
D
Conc. 
Text Solution
Verified by ExpertsThe correct answer is:
D
Iron is rendered passive by conc. 
and other oxidising agents like 
, 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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