How rusting can be prevented by application of grease

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Solution

When metal basically iron comes in contact of moisture or water rust is formed .
In Atmospheric conditions rusting of iron occurs as follows:

$2 F e + O_{2} + H_{2} O \to F e (O H)_{2} \to F e (O H)_{3}$

Fe(OH)₃ is rust which transform into a crystallised form explained as Fe₂O₃.H₂O.

Thus, if we apply grease over the metal it do not allow the metal to come in contact with O₂ and moisture containing water in air and prevent oxidation to form the rust.

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