When pink color complex of ${[Co {(H_{2} O)}_{6}]}^{+ 2}$ dehydrated the color changes to blue. The correct explanation for the change is :

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Distorted octahedral structure is obtained.

A tetrahedral complex is formed.

The octahedral complex becomes square planar.

Dehydration results in the formation of polymeric species.

answer is B.

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Detailed Solution

Hydrated is pink coloured and contains octahedral ions. If this is partially dehydrated by heating, then blue colour is formed due to loss of two water molecules and tetrahedral ions are formed.

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