Answer
Verified
282.3k+ views
Hint: Rusting of iron is a chemical change, which refers to the formation of rust, or mixture of iron oxides, on the surface of iron objects. The rust is formed as a result of redox reaction between iron and oxygen in a moist environment (air containing high levels of moisture).
Complete answer:
Rust on the surface of iron is formed by exposure of iron to oxygen in presence of moisture. The oxygen bonds with the iron atoms, resulting in the formation of iron oxides. This only happens in the presence of moisture and air. The presence of air and water vapour are thus necessary conditions for rusting. Oxygen acts as a very good oxidising agent and iron is a reducing agent, the iron atom thus readily gives electrons when exposed to oxygen. The reaction can be given as: $ Fe \to F{e^{ + 2}} + 2{e^ - } $
The process of rusting is increased with the presence of water. We have observed that iron rusts faster in sea water. The presence of salt makes the process of rusting even faster. Rust is made up of various iron oxides namely Iron (II) oxide or ferrous oxide and Iron (III) oxide or Ferric oxide.
Thus, the causes for the rusting of iron are: Oxidation and Chemical Reaction with Oxygen. The correct answer is Option (D) 1 and 3.
Note:
Rusting causes the iron to become flaky, thus degrading its strength, appearance and permeability. The desirable properties of iron are not found in a rusted iron. Rusting can damage automobiles, railings, grills and other iron structures also.
Complete answer:
Rust on the surface of iron is formed by exposure of iron to oxygen in presence of moisture. The oxygen bonds with the iron atoms, resulting in the formation of iron oxides. This only happens in the presence of moisture and air. The presence of air and water vapour are thus necessary conditions for rusting. Oxygen acts as a very good oxidising agent and iron is a reducing agent, the iron atom thus readily gives electrons when exposed to oxygen. The reaction can be given as: $ Fe \to F{e^{ + 2}} + 2{e^ - } $
The process of rusting is increased with the presence of water. We have observed that iron rusts faster in sea water. The presence of salt makes the process of rusting even faster. Rust is made up of various iron oxides namely Iron (II) oxide or ferrous oxide and Iron (III) oxide or Ferric oxide.
Thus, the causes for the rusting of iron are: Oxidation and Chemical Reaction with Oxygen. The correct answer is Option (D) 1 and 3.
Note:
Rusting causes the iron to become flaky, thus degrading its strength, appearance and permeability. The desirable properties of iron are not found in a rusted iron. Rusting can damage automobiles, railings, grills and other iron structures also.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Write an application to the principal requesting five class 10 english CBSE
Difference Between Plant Cell and Animal Cell
a Tabulate the differences in the characteristics of class 12 chemistry CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
What organs are located on the left side of your body class 11 biology CBSE
Discuss what these phrases mean to you A a yellow wood class 9 english CBSE
List some examples of Rabi and Kharif crops class 8 biology CBSE