what happens when
a)dilute sulphuric acid is added to a mixture of iron fillings and sulphur powder
b)dilute sulphuric acid is added to a mixture of iron fillings and sulphur powder heated to red hot followed by cooling
a. When ​dilute sulphuric acid is added to a mixture of iron fillings and sulphur powder, reaction occusrs between dilute sulphuric acid and iron filings that forms ferrous sulphate and evolution of hydrogen.
Fe + H2SO4 = FeSO4 + H2
b. When dilute sulphuric acid is added to a mixture of iron fillings and sulphur powder heated to red hot followed by cooling​, iron reacts with sulphur to form iron sulphide, FeS. FeS formed reacts with sulphuric acid to form ferrous sulphate and release hydrogendisulphide gas.
Fe + S FeS
FeS + H2SO4 = FeSO4 + H2S
Fe + H2SO4 = FeSO4 + H2
b. When dilute sulphuric acid is added to a mixture of iron fillings and sulphur powder heated to red hot followed by cooling​, iron reacts with sulphur to form iron sulphide, FeS. FeS formed reacts with sulphuric acid to form ferrous sulphate and release hydrogendisulphide gas.
Fe + S FeS
FeS + H2SO4 = FeSO4 + H2S