Substance Y is a pink solid. If substance Y is warmed gently, it changes into a blue solid. When the blue solid is allowed to cool, it stays blue. If water is then added to the blue solid, it turns pink again. What is substance Y?
- Aanhydrous cobalt(II) chloride
- Banhydrous copper(II) sulfate
- Chydrated cobalt(II) chloride
- Dhydrated copper(II) sulfate