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【单选题】
下列关于金属指示剂的封闭的叙述,不正确的是
A.
金属指示剂与金属离子生成配合物的稳定性要比EDTA与金属离子生成配合物的稳定性略大一些
B.
滴定终点时指示剂不能顺利地被EDTA置换出来，使终点延迟
C.
即使加入过量的EDTA也将观察不到终点
D.
金属指示剂与金属离子生成配合物的稳定性要比EDTA与金属离子生成配合物的稳定性略小一些。滴定时，即使加入过量的EDTA也观察不到终点，这种现象称为指示剂的封闭。
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