Question

Mohan heating a mixture of sulphur and iron filings in a china dish till the grey black product was formed . On adding carbon disulphide and stirring which substance will mix

Answer 1

Sulphur and iron fillings are heated therefore the reaction is

S+Fe=FeS (Iron(II) Sulphide)

Now on mixing carbon disulphide nothing will mix into it. Sulphur can get dissolved in carbon disulphide but after forming a compound it cannot.

If carbon disulphide is poured into a mixture of sulphur of iron then sulphur will dissolve leaving behind iron.