When Co(II) chloride is dissolved in concentr | vedclass

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Question

(B) The correct option is $B$. When $Co(II)$ chloride is dissolved in concentrated $HCl$,it forms the complex $[CoCl_4]^{2-}$,which is blue in colour.

Vedclass · Accepted Answer

$[CoCl_4]^{2-}$ is converted to $[Co(H_2O)_6]^{2+}$

Vedclass · Answer

(B) The correct option is $B$. When $Co(II)$ chloride is dissolved in concentrated $HCl$,it forms the complex $[CoCl_4]^{2-}$,which is blue in colour. Upon dilution with water,the water molecules displace the chloride ligands,and the complex is converted to $[Co(H_2O)_6]^{2+}$,which is pink in colour. The reaction is: $CoCl_2 + 2HCl \longrightarrow [CoCl_4]^{2-} + 2H^{+}$ $[CoCl_4]^{2-}_{(aq)} + 6H_2O_{(l)} \rightleftharpoons [Co(H_2O)_6]^{2+}_{(aq)} + 4Cl^{-}_{(aq)}$

When $Co(II)$ chloride is dissolved in concentrated $HCl$,a blue solution is obtained. Upon dilution with water,the colour changes to pink because:

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