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When concentrated HCl is added to an aqueous solution of CoCl2 , its colour changes from reddish pink to deep blue. Which complex ion gives blue colour in this reaction?

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a
CoCl64
b
CoCl63
c
CoCl42
d
CoH2O62+

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detailed solution

Correct option is C

The complex ion is CoH2O62+.

CoH2O62++4ClCoCl42+6H2O reddish pink                  deep blue

Here heat is a reactant in this equilibrium. This means that when heat is added i.e., the solution is being heated, the equilibrium will shift in the direction of the products. This shift in the equilibrium will then the solution blue, the colour of the CoCl42

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