blue
H2O , Fe2O3 , SO2 , SO3
The color fades as there is a discharge of copper two ions to form copper atoms
Ferrous Sulfate is one of the ingredients for enriched corn meal which is found in hot cheetos (the puff kind)
Yes. For instance a solution of KMnO4 (Potassium Permanganate) in H2O (Water) is purple.