X and Y are both elements, and one of them is a non-metal. 1 mole of X is mixed with 1 mole of Y, then the mixture is heated. X and Y react fully to produce substance Z. Substance Z cannot be readily separated back into X and Y. Three statements are provided. Which statements are correct?
- A1 and 3
- B1 only
- C2 and 3
- D2 only