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Bringing a magnet in A, the iron filings will stick to the magnet while the Sulphur will not because the mixture has not been heated. While in B, the compound will not be attracted to the magnet because when it is heated, it is no longer iron filings and Sulphur but it is a compound that is formed from iron and Sulphur called iron sulphide (FeS).
When carbon disulphide(CuS2) is added to a A which is a mixture containing iron filings and Sulphur powder, it leads to the formation of a clear yellow solution after the Sulphur powder dissolves in carbon disulphide(CuS2), when you shake it gently. But since iron fillings are insoluble, they will settle in the bottom. While in B, there will be no reaction between the carbon disulphide(CuS2) and the iron sulphide(FeS) because the carbon disulphide is a non-polar molecule while iron sulphide is an ionic compound. And non-polar molecules cannot dissolve ionic compounds because they do not have the ability to decrease the force of attraction between the ions.
When HCl is added to A which is a mixture of iron filings and Sulphur, they will react with each other to form ferrous chloride also known as Iron (II) chloride (FeCl2) and hydrogen sulphide (H2S) While when HCl is added to B which is iron sulphide (FeS), they react with each other to release a very toxic gas with a very unpleasant smell.
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