When concentrated HCl is added to an aqueous | vedclass

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

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?

Similar Questions

Aluminium trifluoride is insoluble in anhydrous $HF$ but dissolves on addition of $NaF$. Aluminium trifluoride precipitates out of the resulting solution when gaseous $BF_3$ is bubbled through. Give reasons.

Which of the following correctly represents copper sulphate pentahydrate?

Complexes of $CN^-$ ligand are generally...

$AlF_3$ is soluble in $HF$ only in the presence of $KF$. This is due to the formation of:

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$HgI_2 \downarrow + 2KI \longrightarrow K_2[HgI_4]$

Vedclass Test Series

Exam Paper Generator

Online Exam Module