The aqueous solution of salt ofa transition metal ion changes colour from pink to blue, when concentrated hydrochloric acid is added to it. The change in colour is due to:

The aqueous solution of salt ofa transition metal ion changes colour f

1.	The aqueous solution of salt ofa transition metal ion changes colour from pink to blue, when concentrated hydrochloric acid is added to it. The change in colour is due to:
Answer» EVOLUTION of HYDROGEN the changes the oxidation state of the METAL ion Change ini the coordination number of the metal ion from 6 to 4 and formation of new species in solution formation of a coordination complex of the metal ion with HYDROCHLORIC acid protonation of the metal ion. Answer :C