$1.0\,\text{g}$ of each of four distinct compounds of Group 2 elements is heated so that thermal decomposition takes place. The solid residue from every decomposition is the oxide of the Group 2 element. The volume of gas released by each reaction is measured at room conditions. Which substance gives the greatest gas volume?
- Acalcium carbonate
- Bcalcium nitrate
- Cstrontium carbonate
- Dstrontium nitrate