Which of the following statements is not correct about rusting of iron?
- Coating of iron surface by tin prevents rusting, even if the tin coating is peeling off.
- When lies above or , rusting of iron does not take place.
- Dissolved acidic oxides in water act as catalyst in the process of rusting.
- Rusting of iron is envisaged as setting up of electrochemical cell on the surface of iron object.
Solution
Rusting refers to the creation of rust on the surface of iron objects or structures, which is a mixture of iron oxides. In a water-rich environment, rust is created through a redox interaction between oxygen and iron (or high levels of moisture). The creation of a layer of a red, flaky substance that quickly crumbles into a powder characterises the rusting of iron.
As the tin coating is peeled off, then iron is exposed to the atmosphere.
Because rusting occurs as a result of a chemical interaction between iron and air in the presence of moisture, it is a chemical alteration. The iron would not have rusted and gained a brown texture from its dull grey one if the chemical interaction between them had not occurred. As a result, a new substance known as rust forms on the surface of iron.
Hence, the answer is A.
Asked in: JEE Main 2024 (27 Jan Shift 2)