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



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