A) \[M{{g}^{2+}}ion\]
B) Cation
C) \[N{{a}^{+}}ion\]
D) both \[M{{g}^{2+}}\] and \[C{{a}^{2+}}\]
Correct Answer: D
Solution :
EDTA forms soluble complex with \[C{{a}_{2}}\] and \[M{{g}_{2}}\] (present in hard water) and thus they can be estimated by titrating against EDTA using eriochrome black-T as indicator.
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