Question

2.
In the image one of the iron chain is brown in colour due to the :
(a) Formation of a coating of dust which has changed the original colour of the chain.
(b) Formation of iron carbonates which has tarnished the colour of iron chain.
(c) Formation of iron sulphide which is brown in colour.
(d) Formation of rust which is hydrated iron oxide & is brown in colour.​

Answer 1

Answer:

d) Formation of rust which is hydrated iron oxide and is brown in color.

Explanation:

When iron or iron articles are left in the contact with air and moisture for a long period of time, the its surface gets a reddish brown deposit called rust. It is an oxidation reaction. Equation:

Fe + H2O + O2 ---> Fe2O3

☆NOTE:

Fe is iron

H2O is water or moisture

O2 is oxygen

Fe2O3 is rust or iron oxide