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

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 If you heat iron filings ans sulphur to a sufficiently high temperature you form iron sulphide 
Fe + S → FeS 

If you add HCl to this the following reaction occurs: 
FeS + 2HCl → FeCl2 + H2S 
H2S gas is given off and iron chloride is produced,
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