Q is made up of a Group 2 oxide and a Group 2 sulfate in equal quantities. When Q is shaken with water, the mixture is then filtered and a solid residue remains. The solid residue shows no reaction on shaking with $\text{HCl}(\text{aq})$. On shaking the filtrate with $\text{H}_2\text{SO}_4(\text{aq})$, a white precipitate is formed. What might Q be?
- A$\text{BaO} + \text{BaSO}_4$
- B$\text{BaO} + \text{MgSO}_4$
- C$\text{MgO} + \text{BaSO}_4$
- D$\text{MgO} + \text{MgSO}_4$