A white anhydrous salt, $Z$, is heated strongly for 30 minutes. Several gases are evolved. The solid left in the test-tube is then dissolved in a small amount of dilute hydrochloric acid. When a few drops of dilute sulfuric acid are added to the test-tube, a white precipitate is produced. Which substance could be $Z$?
- Abarium carbonate
- Bbarium nitrate
- Cmagnesium carbonate
- Dmagnesium nitrate