X is a pink solid. Y is a blue solid. When X is heated, water is formed and the solid becomes blue. When water is added to Y, the solid becomes pink. Identify 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