The correct answer is D. All the above.
Rusting is a chemical reaction that occurs when iron or an iron alloy comes into contact with oxygen and water. The reaction produces iron oxide, which is also known as rust. Rust is a flaky, reddish-brown substance that can form on the surface of iron or steel objects. It is a major cause of metal corrosion and can lead to the weakening and eventual failure of metal structures.
The rusting process is accelerated by the presence of moisture and carbon dioxide. When iron or steel is exposed to air, a thin layer of oxide forms on the surface of the metal. This oxide layer is protective and helps to prevent further corrosion. However, if the oxide layer is broken or damaged, the iron or steel underneath will be exposed to oxygen and water. This will start the rusting process.
The rusting process can be slowed down by preventing the formation of the oxide layer in the first place. This can be done by coating the metal with a protective layer, such as paint or grease. It can also be slowed down by removing the oxygen and water from the environment. This can be done by storing the metal in a dry, airtight container.
Rusting is a serious problem that can cause significant damage to metal structures. It is important to take steps to prevent rusting and to protect metal objects from the elements.
A. Rusting is caused due to combined action of air, moisture and carbon dioxide.
This is true. Rusting is a chemical reaction that occurs when iron or an iron alloy comes into contact with oxygen and water. The reaction produces iron oxide, which is also known as rust.
B. During rusting, first ferrous bicarbonates are formed.
This is also true. When iron or steel is exposed to air, a thin layer of oxide forms on the surface of the metal. This oxide layer is protective and helps to prevent further corrosion. However, if the oxide layer is broken or damaged, the iron or steel underneath will be exposed to oxygen and water. This will start the rusting process. The first step in the rusting process is the formation of ferrous bicarbonates. Ferrous bicarbonates are a type of iron salt that is formed when iron reacts with carbon dioxide in water.
C. On further oxidation ferrous bicarbonates get converted to ferric bicarbonates.
This is also true. Ferrous bicarbonates are unstable and will eventually oxidize to form ferric bicarbonates. Ferric bicarbonates are a more stable form of iron oxide and are the main component of rust.
D. All the above.
This is the correct answer. Rusting is caused due to the combined action of air, moisture and carbon dioxide. During rusting, first ferrous bicarbonates are formed. On further oxidation ferrous bicarbonates get converted to ferric bicarbonates.