Question

material is exposed to Marshal at to Form B B is a reddish brown colour permanent find out a and b with the chemical equation​

Answer 1

A material (a) when exposed to moist air forms (b), (b) is a reddish brown color compound.

A (the material which reacts) = iron (Fe)

B (the compound formed after the reaction) = hydrated iron oxide or rust (Fe2O3H2O)

Here, iron actually gets corroded.

• what's corrosion basically?

corrosion is a process where a metal reacts with moist air and get corroded (means metals get converted to a more chemically stable form)

• Corrosion of iron is known as rusting.

iron reacts with moist air (oxygen and water) and get oxidized to form iron oxide or rust which is a reddish brown substance.

Chemical equation ⤵⤵⤵

4Fe + 3O2 + 2H2O ------> 2FeO3H2O