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Question

Which of the following is true?


  1. Rusting will take place in absence of water

  2. Rusting will take place in absence of air

  3. Rusting will not take place in presence of water and air

  4. None of the above

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Solution

The correct option is D

None of the above


Explanation for correct option:

D. None of the above

Rusting:

  • Rusting is a chemical change.
  • Rusting of iron is the formation of rust/mixture of iron oxides on the surface of iron objects.
  • It is a redox reaction that takes place between iron and oxygen under certain conditions such as the presence of water/ air/moisture.
  • For rusting the two essential need is the presence of oxygen and water.
  • The chemical equation of rusting can be depicted as:

4Fe(s)+2O2(g)x.H2O2Fe2O3.xH2O(aq)Rust

Explanation for incorrect options:

Rusting takes place in the presence of air and moisture. Thus options A, B, and C are incorrect.

Hence, the correct option is D i.e. None of the above.


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