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

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

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:

Similar Questions

Which of the following properties are exhibited by the $CN^-$ ion towards metal compounds?
$(a)$ Reducing
$(b)$ Oxidizing
$(c)$ Complexing

Copper sulphate dissolves in excess of $KCN$ to give

When pyridine is added to an aqueous solution of nickel sulfate followed by the addition of an aqueous solution of sodium nitrite,deep blue crystals of .......... are obtained.

The brown ring test for $NO_2^-$ and $NO_3^-$ ions is due to the formation of which of the following complex ions?

The number of hydrogen-bonded water molecule$(s)$ associated with the stoichiometry $CuSO_{4} \cdot 5H_{2}O$ is .... .

Vedclass Test Series

Exam Paper Generator

Online Exam Module