An aqueous solution of CoCl2 on addition of excess of concentrated HCl turns blue due to formation of

Question

An aqueous solution of CoCl2 on addition of excess of concentrated HCl turns blue due to formation of (A) [Co(H2 O)4 Cl2 ] (B) [Co(H2 O)2 Cl4 ]2- (C) [CoCl4 ]2- (D) [Co(H2 O)2 Cl2 ]

Tardigrade Admin · Accepted Answer

CoCl 2 is weak Lewis. It reacts with chloride ion to produce salt containing the tetrahedral [ CoCl 4]2- ion which is blue in colour. The oxidation state of CO is +2.

Q. An aqueous solution of $C o C l_{2}$ on addition of excess of concentrated $H Cl$ turns blue due to formation of

$[C o (H_{2} O)_{4} C l_{2}]$

$[C o (H_{2} O)_{2} C l_{4}]^{2 -}$

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

$[C o (H_{2} O)_{2} C l_{2}]$

$C o C l_{2}$ is weak Lewis. It reacts with chloride ion to produce salt containing the tetrahedral $[C o C l_{4}]^{2 -}$ ion which is blue in colour. The oxidation state of $CO$ is $+ 2$ .

Q. An aqueous solution of CoCl2​ on addition of excess of concentrated HCl turns blue due to formation of

[Co(H2​O)4​Cl2​]

[Co(H2​O)2​Cl4​]2−

[CoCl4​]2−

[Co(H2​O)2​Cl2​]