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A) \[{{X}^{2-}},{{Y}^{2+}}\]
B) \[{{X}^{2+}},{{Y}^{2-}}\]
C) \[{{X}^{2-}},{{Y}^{2-}}\]
D) \[{{X}^{2+}},{{Y}^{2+}}\]
E) None of these
Correct Answer: A
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