When concentrated HCl is added to an aqueous | vedclass

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Question

(A) The aqueous solution of $CoCl_2$ contains the octahedral complex $[Co(H_2O)_6]^{2+}$,which is reddish-pink in colour.When concentrated $HCl$ is ad

Vedclass · Accepted Answer

$[CoCl_4]^{2-}$

Vedclass · Answer

(A) The aqueous solution of $CoCl_2$ contains the octahedral complex $[Co(H_2O)_6]^{2+}$,which is reddish-pink in colour.When concentrated $HCl$ is added,the chloride ions $(Cl^-)$ act as ligands and replace the water molecules to form the tetrahedral complex $[CoCl_4]^{2-}$.The formation of the tetrahedral $[CoCl_4]^{2-}$ complex is responsible for the deep blue colour observed in the solution.Therefore,the correct complex ion is $[CoCl_4]^{2-}$.

When concentrated $HCl$ is added to an aqueous solution of $CoCl_2$,its colour changes from reddish pink to deep blue. Which complex ion gives blue colour in this reaction?

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