Question

Why is oxygen necessary for rusting?

Answer 1

Answer:

Oxygen necessary for rusting as iron can form iron oxide when in combined with oxygen ,, completing the oxide and forming ferrous oxide that is Rust.

or

Fe2.nH203

Answer 2

Rusting

Introduction:

Rusting is a form of oxidation. Rust is formed when iron combines with water and oxygen to generate hydrated iron(III) oxide.

Process:

• The oxidation of iron occurs at the anode during rusting, and while it is not aided by the presence of oxygen, it is largely favored by the presence of water.
• At the cathode, the ferrous ion produced by iron oxidation combines with hydroxide ions; this reaction is aided by the presence of oxygen. The cathode process occurs faster in the presence of oxygen, and iron is unaffected.

Need of oxygen for rusting:

• In the presence of oxygen and moisture, rusting develops quickly. It is, however, the oxygen that reacts with the metal. It appears that water serves as a catalyst.

• When chemists initially used electrolysis to separate key chemicals, they frequently discovered oxygen. So many substances contained oxygen—carbonates, silicates, and nitrates, to name a few.
• The compound was separated by electrolysis, with one component going to the positive terminal and the other to the negative terminal. It was almost as if rusting was a kind of slow-burning fire.

Therefore, we know that if the temperature is high enough and oxygen is available, practically any material will burn. Oxygen has a high reactivity.

To know more about 'oxidation' and 'reduction', here

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