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At room temperature the following equili...

At room temperature the following equilibrium mixture is blue but when cooled in a freezing mixture, the colour of mixture turns pink. What is the nature of reaction.
`[Co(H_2O)_6]_(aq)^(2+)+ 4Cl^(-) leftrightarrow [CoCl_4]_(aq)^(2-)+6H_2O(l)`
Pink Blue

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This observation indicates that decrease of temperature favours backward reaction. Hence the reaction (forward) in endothermic.
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