Question

Is a mixture of iron foil and sulphur -- a homogeneous or a heterogeneous mixture? Explain.

Answer 1

1. A’ is a mixture which is prepared by mixing iron filings and sulphur.
2. ‘B’ is a compound which is formed by strongly heating a mixture of iron filings and sulphur. The chemical equation for this change is as follows:
   
3. Mixture of iron filings and sulphur is heterogeneous while the compound iron sulphide is homogeneous.
4. Properties of FeS are different from the properties of its constituents.