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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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