Question

Metal x reacts with water and air to give out a brown substance.metal x is painted stop the formation of the brown substance.name the metal x.which component of air reacts with metal x .what is the common name for the brown substance. name the process

Answer 1

Answer:

x - Iron

Oxygen and moisture present in the air reacts with iron.

Common name for the brown substance is *Rust*

The process name is *Rusting*

Answer 2

The answer is explained below.

Explanation:

• Rusting is a slow oxidation process in which iron slowly reacts with oxygen of the air in the presence of moisture and produces a flaky brown substance called rust.    
•          $\[\begin{array}{l}4Fe\,\, + \,\,\,2{O_2} + \,\,\,\,{H_2}O\,\,\, \to \,\,\,\,\,2F{e_2}{O_3} \cdot {H_2}O\\Iron\,\,\,Oxygen\,\,Moisture\,\,\,\,\,\,Hydrated\,iron\left[ {III} \right]oxide\end{array}\]$
• Hydrated iron[III] oxide or hydrated ferric oxide ( $\[F{e_2}{O_3} \cdot {H_2}O\]$) ie, Rust forms a reddish-brown coating over iron.
• Therefore, the metal X is Iron.
• Oxygen and moisture present in the atmosphere causes the rusting
• The brown substance coated on the surface of iron when exposed to the atmosphere is rust. This process is known as rusting.