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Q.

When pink color complex of  Co(H2O)6+2dehydrated the color changes to blue. The correct explanation for the change is :

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a

The octahedral complex becomes square planar.

b

A tetrahedral complex is formed.

c

Distorted octahedral structure is obtained.

d

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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