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in Chemistry by (74.0k points)
The aqueous solution of salt of a transition metal ion changes colour from pink to blue, when concentrated hydrochloric acid is added to it. The change in colour is due to:
A. Evolution of hydrogen the changes the oxidation state of the metal ion
B. Change ini the coordination number of the metal ion from 6 to 4 and formation of new species in solution
C. formation of a coordination complex of the metal ion with hydrochloric acid
D. protonation of the metal ion.

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1 Answer

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by (73.8k points)
Correct Answer - C

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