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[Co(H(2)O)(6)]^(2+)(aq)("pink")+4Cl^(-)(...

`[Co(H_(2)O)_(6)]^(2+)(aq)("pink")+4Cl^(-)(aq)hArr[CoCl_(4)]^(2+)(aq)("blue")+6H_(2)O(l)`
In the above reaction at equilibrium, the reaction mixture is blue in colour at room temperature. On cooling this mixture, it becomes pink in colour On the basis of this information, which one the following is true ?

A

d-d transistion

B

Presence of water molecules

C

Inter atomic transfer of electrons

D

None of the above

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