Like blue color of CUSO4, various salts have different colors. Why is this so and some salts have different colors?
Ligands connected to a metal center forms a coordination complex. The color for a specific coordination complex can be predicted using "Crystal Field Theory".
http://wwwchem.uwimona.edu.jm/courses/CFT.html
All d block metal salts undergo metal to ligand or ligand to metal charge transfer, which is adsorbed in the visible region. However, S and P block element salts like NaCl, KCl, CaCl2, MgCl2 etc are generally not colored.
The energy difference between d-oribitals lies in visible spectrum that why d-block elements are genrally coloured due to electronic transtion between these d-orbitals where as in the case s and p block element salts the energy required for electronic trasition is very high and it lies in u.v or x-ray region which we cant see. that is why they are colour less in visible region
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