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Two iron cans are taken. One of them is coated with zinc and the second one is coated with tin. A scratch is made on the coating of both the cans and the cans are kept in open air for some days. In which case the iron can will get rusted?

Two iron cans are taken. One of them is coated with zinc and the second one is coated with tin. A scratch is made on the coating of both the cans and the cans are kept in open air for some days. In which case the iron can will get rusted? Correct Answer Only the can coated with tin will get rusted.

The correct answer is Only the can coated with tin will get rusted.

Concept:

Corrosion:

  • Corrosion is a process of deterioration of a metal as a result of its reaction with air or water (environment) surrounding it.
  • In the case of iron, corrosion is called rusting.
  • Chemically rust is a hydrated form of ferric oxide, Fe2O3 · xH2O.
  • Rusting of iron is generally caused by moisture, carbon dioxide, and oxygen present in the air.

Explanation:

Galvanization:

  • When iron is coated with zinc to prevent it from getting rusted, the process is called galvanization.
  • The zinc layer stops oxygen and water reaching the iron.
  • Zinc is more reactive than iron, so it also acts as a sacrificial metal.
  • This protection works, even if the zinc layer is scratched.
  • Tin, on the other hand, is less reactive than iron and has less affinity for oxygen as compared to zinc. 
  • When iron can coated with tin is scratched, the exposed surface of iron will get rusted. 
  • But, in the case of Zinc even if it is scratched, the iron will not be rusted. 

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