Q.

When pink CoH2O62⊕,is dehydrated the color changes to blue. The shape of the pink color complex 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

Simple octahedral complex

answer is D.

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Detailed Solution

Hydrated CoCl2·6H2O is pink coloured and contians octahedral CoH2O62+ ions. If this is partially dehydrated by heating, then blue coloured tetrahedral ions CoH2O42+ are formed. [Co(H2O)6]2+pink⇌[Co(H2O)4]2+blue+2H2O
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