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You are here: Home / Class 10 / Metals and Non-metals / Corrosion

Corrosion

Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 9 Comments

Question 1 Define the term corrosion?

Question 2 What is meant by rusting of iron?

Question 3 State the conditions necessary for rusting of iron?

Question 4 State the ways to prevent the rusting of iron?

Question 5 Name the metal used for galvanising iron?

Question 6 Why copper objects lose their shine after sometime?

Question 7 Why silver articles became black when exposed to air?

Question 8 Why gold ornaments look new even after several years of use?

Corrosion

The eating up of metals by the action of air,moisture or a chemical on their surface is called corrosion.

The copper objects lose their shine after sometime due to the formation of copper oxide on them.When a copper object reacts with moist carbon dioxide,it loses its shiny brown surface and gains a green coat(basic copper oxide which is a mixture of copper carbonate and copper hydroxide)

Silver articles became black after sometime when exposed to air because it react with sulphur in air to form a coating of silver sulphide.

The corrosion of iron is called rusting.When an iron object is left in damp air for a considerable time,it gets covered with a red brown flaky substance called rust.
Rust is hydrated iron(III) oxide.The formula of rust is Fe2O3.nH2O
The two conditions necessary for rusting of iron is presence of air and water.

Prevention of rusting

1)By painting
2)BY applying grease or oil.
3)By galvanisation:The process of depositing a thin layer of zinc metal on iron.
4)By tin plating and chromium plating.
5)By alloying it

Filed Under: Class 10, Metals and Non-metals Tagged With: copper objects, corrosion, galvanisation, prevention of rusting, rust, rusting, silver articles

About Mrs Shilpi Nagpal

Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading Free Education to everyone.

Reader Interactions

Comments

  1. Ambika says

    June 11, 2018 at 8:01 am

    Thanks. … It was really helpful information.

    Reply
  2. Veda says

    February 20, 2019 at 12:35 pm

    Nice

    Reply
  3. Vidhya says

    March 10, 2019 at 9:47 pm

    Thanks a million lots

    Reply
  4. isha says

    July 25, 2019 at 10:31 pm

    very interesting to study

    Reply
    • ABHISHEK says

      January 3, 2020 at 10:44 am

      Thanks for my help

      Reply
  5. Sandhya says

    February 8, 2020 at 2:35 pm

    It was very helpful …..thank you (^v^)

    Reply
  6. Rishu says

    April 23, 2021 at 3:24 pm

    A Big thanks 🙂

    Reply
  7. UKNOWHU says

    November 10, 2021 at 6:35 pm

    THIS REALLY HELPED

    Reply
  8. Radhika gupta says

    April 2, 2022 at 12:41 am

    Really helped

    Reply

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