Why are all salts of scandium white ?

All salts are

(a) Explain the structure of dichromate ion. (b) Why are cadmium salt white ?

why are some salts are called hydrated salts give 2 example of white colour hydrated salts with the chemical formula?

(a) Why are some salts called hydrated salts ? (b) Give two examples of white coloured hydrated slts alongwith their chemical formula.

Why are Zn salts colourless ?

Why are Zn^(2+) salts white, while Cu^(2+) salts blue ?