Question

A student heats calculated amounts of iron filings and sulphur powder together in a boiling tube. He will obtain :
(1) a homogeneous mixture of Fe and S
(2) a heterogeneous compound of Fe and S
(3) a homogeneous compound of FeS
(4) a heterogeneous mixture of FeS, Fe and S

Answer 1

When iron and sulphur are heated together in a boiling tube, they react together to form a grey-black compound of iron sulphide. The mixture formed will be homogeneous i.e. two elements mix together thoroughly and cannot be separated.
$\mathrm{Fe}+\mathrm{S}\to \mathrm{FeS}$

Hence, the correct answer is option 3.