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Class 7
Chapter 6 Class 7 - Physical and Chemical Changes
  •  a red brown flaky substance called rust
  • The process by which rust appears on iron surfaces is known as rusting of iron .

Iron (fe ) + oxygen ( o2 from air)+ water (H2o) —-> rust (Fe203) from oxide

  • It is necessary to have both water and oxygen present for rusting to take place. 
  • So, rusting would not take place in a dry place .
  • Hence, rusting can be prevented by not letting iron items come into contact with water or oxygen.
  • We can prevent rusting by applying a coat of paint or grease regularly to the object.
  • Another way is to deposit a layer of metal like chromium or zinc on the iron.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo