强酸性溶液X中可能含有Na+、K+、NH4+、Fe2+、A13+、CO32－、SO32－、SO42－、
C1－中的若干种，某同学为了确认其成分，取X溶液进行连续实验，实验过程及产物如下： 
下列结论正确的是
| A．X中不能确定的离子是 A13+、Na+、K+和C1－ |
| B．气体F经催化氧化可直接生成气体D |
| C．沉淀C一定是BaSO4、沉淀G一定是Fe(OH)3 、沉淀I一定是Al(OH )3 |
| D．X中肯定存在Na+、Fe2+、A13+、NH4+、SO42－ |
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