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Question
When chloride ions are added to a solution containing $$Cu^{2+}(aq)$$, the complex ion $$[CuCl_4]^{2-}(aq)$$ is formed. State the colours of $$Cu^{2+}(aq)$$ and $$[CuCl_4]^{2-}(aq)$$. $$Cu^{2+}(aq)$$ __________ $$[CuCl_4]^{2-}(aq)$$ _________.
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