On heating pink crystals of cobalt(II) chloride, water vapour is released and the solid turns blue. $\text{CoCl}_2\!\cdot\!6\text{H}_2\text{O} \rightleftharpoons \text{CoCl}_2 + 6\text{H}_2\text{O}$ What occurs when water is added to the blue solid?
- Acolour changes to pink; temperature decreases
- Bcolour changes to pink; temperature increases
- Cremains blue; temperature decreases
- Dremains blue; temperature increases