D-And F-Block Elements Ques 154
Question: The passivity of iron in concentrated nitric acid is due to
[MP PMT 1994]
Options:
A) Ferric nitrate coating on the metal
B) Ammonium nitrate coating on the metal
C) A thin oxide layer coating on the metal
D) A hydride coating on the metal
Show Answer
Answer:
Correct Answer: C
Solution:
A thin layer of $ Fe_3O_4 $ is formed on the Fe metal
