Question

Which colour mix and crush iron fillings and sulphur powder?

Answer 1

blue colour mix and cast iron fillings and sulphur powder

Answer 2

When iron fillings and sulphur powder are mixed both retain their properties. It means they have not undergone any chemical reaction. Therefore mixing of iron and sulphur is a physical change. When iron fillings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide (FeS).