A) \[C{{a}^{++}}\,or\,M{{n}^{++}}\]
B) \[N{{a}^{+}}\,or\,C{{l}^{-}}\]
C) \[N{{a}^{+}}\,or\,{{K}^{+}}\]
D) \[M{{n}^{++}}\,or\,M{{g}^{+2}}\]
Correct Answer: D
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