SolutionHard
Question
When concentrated HCl is added to an aqueous solution of CoCl2, its colour changes from reddish pink to deep blue. Which complex ion gives blue colour in this reaction ?
Options
A.[CoCl4]2-
B.[CoCl6]3-
C.[CoCl6]4-
D.[Co(H2O)6]2+
Solution
[CoCl4]2- is formed which is blue in colour.
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