Question

Chemical formula of rust is $F{e_2}{O_3}$
(A) True
(B) False

Answer 1

Hint: You might have seen an iron barbed wire which has turned red. You might have also seen some old metallic objects at home. You would see that these objects have turned reddish brown, unlike their original metallic colour. This is what we call rust.

Complete step by step solution:
First of all, let’s go through the definition of rust.
Rust is an iron oxide, usually reddish-brown oxide formed by the reaction of iron and oxygen in the presence of water or moisture present in the air. Given sufficient time, any iron mass could eventually convert entirely to rust in the presence of water and oxygen. Rust is actually a mixture of different oxides of iron, but the oxide of Fe (III) is an important part of that. The rusting of iron is a good example of the process of corrosion. Rusting is the common term for corrosion of iron and its alloys like steel. Many other metals undergo similar oxidation, but the resulting oxides aren't commonly called rust.
If you live in a climate where the environment is corrosive, for example near the ocean, it is better to make the window and doors of your house from wood instead of iron and steel, because wood does not rust.
In order to understand what rust is, we have to go through its formation procedure.
Rust is formed when iron reacts with oxygen in the presence of moisture in the air. Rusting happens more quickly in the presence of acids. The following chemical equation represents the reaction:
$4Fe + 3{O_2}(g) \to 2F{e_2}{O_3}$
Water is necessary for the oxidation reaction to occur and to facilitate the transport of the electrons. Since there are water droplets in the air, iron will rust over time when exposed to the air. Further, the reaction proceeds as:
$F{e_2}{O_3} + x.{H_2}O \to F{e_2}{O_3}.x{H_2}O$
$F{e_2}{O_3}$ is also a type of rust which is formed in the presence of high oxygen and low moisture called brown rust. Even though it is a type of rust but it is not the general formula.

Therefore, the correct answer is (B)- False.

Note: Don’t think that corrosion always degrades the quality of metal. In case of iron, corrosion forms rust but in cases of aluminium, it’s oxide can be very useful as it acts as a protective layer and protects it from the external environment.