Equations showing the preparation of anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are given below. $\text{CoCl}_2 \cdot 6\text{H}_2\text{O} \rightarrow \text{CoCl}_2 + 6\text{H}_2\text{O}$ $\text{CuSO}_4 \cdot 5\text{H}_2\text{O} \rightarrow \text{CuSO}_4 + 5\text{H}_2\text{O}$ Which statement about these reactions is not correct?
- ABoth reactions are exothermic.
- BBoth reactions are reversible.
- CHydrated cobalt(II) chloride changes colour from pink to blue.
- DHydrated copper(II) sulfate changes colour from blue to white.