Question

Iron coated with paint or grease does not rust.

Answer 1

$\large{\underline{\underline{\red{\tt{Answer:}}}}}$

• Yes , iron coated with grease or paint does not rust .Paint or grease form a layer on the iron article and prevent direct contact with moist air and iron material

${\underline{\green{\bf{\dag More\: related\: information:}}}}$

♣ CORROSION ♣:

• The degradation of metals by action of air , moisture or chemical on their surface is called corrosion.
• The chemical process involved in rusting is oxidation.

$\small{\underline{\underline{\orange{\bf{\leadsto CORROSION\:OF\:IRON(Fe):}}}}}$

• Iron articles get coated with a reddish brown powder when left open in moist air for long time. Rust is actually hydrated ferric oxide.
• Formula of Ferric oxide is $\sf{Fe_2 O_3. xH_2 O}$

$\pink{\tt{\underset{Iron}{2Fe(s)}+\underset{oxygen}{\dfrac{3}{2}O_2(g)}+\underset{water}{H_2 O(l)} \xrightarrow{Rusting}\underset{Rust}{Fe_2O_3 . xH_2O}}}$

Other methods of preventing rusting of Iron:-

• By Galvanisation.
• By Tin and Chromium plating.
• By Alloying.

Silver and Copper lose their lustre by gaining black and green coating of Silver sulphide and basic copper carbonate respectively.

$\pink{\tt{\underset{Silver}{4Ag(s)}+\underset{Oxygen}{O_2(g)}+\underset{Hydrogen\: Sulphide}{H_2S(g)}\longrightarrow \underset{Silver\: sulphide}{2Ag_2S(s)}+\underset{water}{H_2O}}}$

$\purple{\tt{\underset{\orange{Copper}}{2Cu(s)}+\underset{\red{From\:moist\:air}}{\underbrace{\underset{\green{Carbon\:dioxide}}{CO_2(g)}+\underset{\pink{Oxygen}}{O_2(g)}+\underset{\blue{water}}{H_2O(l)}}}\longrightarrow \underset{\green{Basic\: copper\: carbonate}}{CuCO_3.Cu(OH)_2(s)}}}$