Question

The molecular formula of ferric oxide___
A) ${\text{FeO}}$
B) $F{e_2}O$
C) $F{e_2}{O_3}$
D) ${\text{None of these}}$

Answer 1

Hint: Iron (III) oxide or ferric oxide is the inorganic compound with the formula $F{e_2}{O_3}$ . It is one of the three main oxides of iron, the other two being iron (II) oxide, which is rare; and iron (II, III) oxide, which also occurs naturally as the mineral magnetite.

Complete step by step answer:
(A) ${\text{FeO}}$: Iron (II) oxide or ferrous oxide is the inorganic compound with the formula ${\text{FeO}}$. Its mineral form is known as wüstite. One of several iron oxides, it is a black-coloured powder that is sometimes confused with rust, the latter of which consists of hydrated iron (III) oxide.
(B) $F{e_2}O$: The oxidation is the process involved in the ferrous oxide. The iron ion $F{e^{ + 3}}$oxidation number is $3$(three).
And for the ${O^{2 - }}$ oxide ion the oxidation number is $2$.
The oxidative summation of the iron ion and the oxygen ion equals to zero.
The oxidation number carries to be in a different oxidation state resulting in the electronically neutral substance.
The oxidation results in the donation and the sharing of electrons.
(C) $F{e_2}{O_3}$:
Iron (III) oxide or ferric oxide is the inorganic compound with the formula $F{e_2}{O_3}$ . It is one of the three main oxides of iron, the other two being iron (II) oxide, which is rare; and iron (II, III) oxide, which also occurs naturally as the mineral magnetite.
Iron (III) oxide is a product of the oxidation of iron. It can be prepared in the laboratory by electrolyzing a solution of sodium bicarbonate, an inert electrolyte, with an iron anode:
\[4{\text{ Fe }} + {\text{ }}3{\text{ }}{O_2}\; + {\text{ }}2{\text{ }}{H_2}O{\text{ }} \to {\text{ }}4{\text{ FeO}}\left( {{\text{OH}}} \right)\]
The resulting hydrated iron (III) oxide, written here as \[FeO\left( {OH} \right)\]dehydrates around \[200\;^\circ C\].
\[2{\text{ FeO}}\left( {{\text{OH}}} \right){\text{ }} \to {\text{ }}F{e_2}{O_3}\; + {\text{ }}{H_2}O\]
Therefore, option C is the correct answer.

Note:
As the mineral known as hematite,$F{e_2}{O_3}$ is the main source of iron for the steel industry. $F{e_2}{O_3}$ is readily attacked by acids. Iron (III) oxide is often called rust, and to some extent this label is useful, because rust shares several properties and has a similar composition; however, in chemistry, rust is considered an ill-defined material, described as hydrated ferric oxide.