A) \[M{{g}^{2+}}\] and \[C{{a}^{2+}}\]
B) \[C{{a}^{2+}}\] and \[N{{a}^{+}}\]
C) \[M{{g}^{2+}}\] and \[CO_{3}^{2-}\]
D) \[CO_{3}^{2-}\] and \[C{{l}^{-}}\]
Correct Answer: A
Solution :
[a] As \[N{{a}^{+}}\] ions in sodium zeolite are replaced by \[C{{a}^{2+}}\] and \[M{{g}^{2+}}\] ions present in hard water, these two ions will not be present.
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