Single Choice

Passivity of iron is due to formation of:

A$${ Fe }_{ 2 }{ O }_{ 3 }$$
B$${ Fe }_{ 3 }{ O }_{ 4 }$$
Correct Answer
C$$Fe{ SO }_{ 4 }$$
Dnone of these

Solution

The passivity of iron is due to the formation of a thin film of ferroso-ferric oxide, Fe3O4 on the surface of iron.

SIMILAR QUESTIONS

d - block and f - block Elements

Which of the following is an amphoteric oxide?

d - block and f - block Elements

Which of the following compound is blue?

d - block and f - block Elements

Which of the following oxides are basic in nature ?

d - block and f - block Elements

Zinc oxide is normally white but turns yellow on heating and becomes white again on cooling because of:

d - block and f - block Elements

The Oxidation states of $$Cr$$ in $$[Cr(H_2O)_6]Cl_3, [Cr(C_6H_6)_2]$$, and $$K_2[Cr(CN)_2(O)_2(O_2)(NH_3]$$ respectively are:

d - block and f - block Elements

Which of the following compounds is metallic and ferromagnetic?

d - block and f - block Elements

In acidic medium, $$H_2O_2$$ changes $$Cr_2O_7^{- 2}$$ to $$CrO_5$$ which has two ($$-O- O-$$) bonds oxidation state of $$Cr$$ in $$CrO_5$$ is:

d - block and f - block Elements

Name the oxometal anions of the first series of the transition metals in which the metal exhibits the oxidation state equal to its group number.

d - block and f - block Elements

$$Cr - C$$ bond in the compound $$[Cr(CO)_6]$$ shows $$\pi$$ - character due to :

d - block and f - block Elements

Fe is made passive by:

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