An aqueous solution of CoCl_2 on addition of | vedclass

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(C) The aqueous solution of $CoCl_2$ contains the octahedral complex $[Co(H_2O)_6]^{2+}$,which is pink in color.Upon adding excess concentrated $HCl$,

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$[CoCl_4]^{2-}$

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(C) The aqueous solution of $CoCl_2$ contains the octahedral complex $[Co(H_2O)_6]^{2+}$,which is pink in color.Upon adding excess concentrated $HCl$,the chloride ions $(Cl^-)$ act as ligands and displace the water molecules.This leads to the formation of the tetrahedral complex $[CoCl_4]^{2-}$,which is blue in color.The reaction is: $[Co(H_2O)_6]^{2+} + 4Cl^- \rightarrow [CoCl_4]^{2-} + 6H_2O$.

An aqueous solution of $CoCl_2$ on addition of excess of concentrated $HCl$ turns blue due to the formation of:

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