Qualitative Analysis : Colour of Solid and their Possible Identities

Coloured crystalline substances are usually hydrated salts of d-block elements. The colour of the solid substance may provide evidence for its identity.

Study the colours of a solid with their corresponding possible identities that flashes.
yellowPbO, S
brownPbO2, Fe2O3
greenCr2O3, NiCO3
blackC, CuO, MnO2
redPb3O4, Cu2O
off-whiteMnCO3