The colour of given reaction mixture is blue at room temperature

CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

The colour of given reaction mixture is blue at room temperature. On [Co(H2O)6]2+(aq.)+4Cl−⇌[CoCl4]2−(aq.)+6H2O[\text{Co}(\text{H}_2\text{O})_6]^{2+}(\text{aq.}) + 4\text{Cl}^- \rightleftharpoons [\text{CoCl}_4]^{2-}(\text{aq.}) + 6\text{H}_2\text{O} Pink Blue cooling it becomes pink, this indicates that : (1) reaction is exothermic (2) reaction is endothermic (3) reaction shifts in forward direction on cooling (4) none of the above

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