The aqueous solution of transition metal salt changes colour from pink – InterviewSolution

1.	The aqueous solution of transition metal salt changes colour from pink to blue, when concentrated hydrochloric acid is added to it. The changes in colour is due to:
Answer» EVOLUTION of hydrogen that CHANGES the OXIDATION state of the METAL ion change in the coordination number of the metal ion from 6 to 4 and formation of new species in solution formation of a coordination complexof the metal ion with hydrochloric acid protonation of the metal ion Answer :B

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