X is a Group II metal. When its carbonate is heated in a Bunsen flame, it breaks down to form carbon dioxide and a white solid residue as the only products. This white solid residue is only slightly soluble in water. Even if large quantities of the solid residue are added to water, the pH of the saturated solution is lower than that of limewater. Which metal could X be?
- Amagnesium
- Bcalcium
- Cstrontium
- Dbarium