Question:

An aqueous solution of $CoCl_2$ on addition of excess of concentrated $HCl$ turns blue due to formation of

Updated On: Jul 2, 2022
  • $[Co(H_2 O)_4 Cl_2 ]$
  • $[Co(H_2 O)_2 Cl_4 ]^{2-}$
  • $[CoCl_4 ]^{2-}$
  • $[Co(H_2 O)_2 Cl_2 ]$
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The Correct Option is C

Solution and Explanation

$CoCl _{2}$ is weak Lewis. It reacts with chloride ion to produce salt containing the tetrahedral $\left[ CoCl _{4}\right]^{2-}$ ion which is blue in colour. The oxidation state of $CO$ is $+2$.
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Concepts Used:

Coordination Compounds

A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.

Coordination entity:

A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.

Ligands:

A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.