Question

• A _________ of Iron and Sulphur contains grey and yellow particles.(mixture/compound)

Answer 1

A mixture of Iron($\mathrm{Fe}$) and Sulphur($\mathrm{S}$) contains grey and yellow particles because Iron($\mathrm{Fe}$) react with Sulphur($\mathrm{S}$) in the presence of Oxygen (${\mathrm{O}}_2$) and Iron Sulphide($\mathrm{FeS}$) is formed.

Chemical equation:

$\mathrm{Fe}\left(\mathrm{s}\right)+\mathrm{S}\left(\mathrm{s}\right)\to \mathrm{FeS}\left(\mathrm{s}\right)$