Question

Formula of magnate is -
A.$F{e_2}{O_3}$
B.$Fe{S_2}$
C.$FeC{O_3}$
D.$F{e_3}{O_4}$

Answer 1

We need to remember that the molecular formula specifies the numbers of atoms present in the molecule of a chemical substance. And the molecular formula is the same as that of the empirical formula. The molecular formula mainly contains the chemical symbols of the corresponding element and it has numeric subscripts to express the number of atoms present in a molecule. Therefore, the molecular formula will show the actual number of atoms present in a molecule.

Complete answer:
The $F{e_2}{O_3}$ is the formula of hematite. Hence, option (A) is incorrect.
The $Fe{S_2}$ is the formula of the pyrite. Hence, option (B) is incorrect.
The $FeC{O_3}$ is the formula of the siderite. Hence, option (C) is incorrect.
The chemical formula of magnetite is $F{e_3}{O_4}$. And it is considered as the naturally occurring mineral. The magnetite is the oxides of iron and it is called ferromagnetic. The magnetite is also known as lodestone or otherwise known as iron oxide mineral or magnetic iron ore. The magnetite is very toxic in humans which causes disrupting normal cellular function and oxidative stress etc. And the formula of magnetite is $F{e_3}{O_4}$.

Hence option (D) is correct.

Note:
We must have to remember that the magnetite is used as a mineral and its primary component is known as iron oxide having the chemical formula $F{e_3}{O_4}$, which consist of same amount of iron (II) and iron (III). The magnetite is mainly seen in the sedimentary rocks, igneous and metaphoric. The magnetite is considered as a one of the oxide of the iron metal which is ferromagnetic. When the magnetite is attracted with the magnet, it will be magnetite and there is a formation of permanent magnet.