When concentrated HCl is added to an a queous solution of $C o C l_{2}$ , its colour changes from reddish pink to deep blue. Which complex ion gives colour in this reaction?
$[C o C l_{6}]^{4 -}$
$[C o C l_{6}]^{3 -}$
$[C o (H_{2} O)_{6}]^{2 +}$
$[C o C l_{4}]^{2 -}$

[C o C l_{6}]^{4 -}

[C o (H_{2} O)_{6}]^{2 +}

[C o C l_{4}]^{2 -}

[C o C l_{6}]^{3 -}

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When concentrated $H C l$ is added to an aqueous solution of $C o C l_{2}$ , its colour changes from reddish pink to deep blue. $C o (I I)$ is oxidized to $C o (I I I)$ .
This indicates the formation of $[C o C l_{6}]^{3 -}$ .
$C o C l_{2} H C l - - \to [C o C l_{6}]^{3 -}$ .

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When concentrated $H C l$ is added to an aqueous solution of $C o C l_{2}$ , its colour changes from reddish pink to deep blue. $C o (I I)$ is oxidized to $C o (I I I)$ .
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