Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Pure conc. 
makes iron passive as the surface is covered with protective layer of
A
B
FeO
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
The passivity of iron is due to the formation of a thin insoluble and invisible iron film on surface which prevents its further reactions. The film is due to the formation of 
.
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