X is a pink solid, while Y is a blue solid. On heating X, water is given off and the solid changes to blue. If water is then added to Y, the solid becomes pink. What are X and Y?
- AX: anhydrous cobalt(II) chloride; Y: hydrated cobalt(II) chloride
- BX: hydrated cobalt(II) chloride; Y: anhydrous cobalt(II) chloride
- CX: anhydrous copper(II) sulfate; Y: hydrated copper(II) sulfate
- DX: hydrated copper(II) sulfate; Y: anhydrous copper(II) sulfate