A) \[N{{a}^{+}},\,SO_{3}^{2-}\]
B) \[NH_{4}^{+},\,CO_{3}^{2-}\]
C) \[N{{a}^{+}},\,{{S}^{-2}}\]
D) \[F{{e}^{+3}},\,PO_{4}^{-3}\]
Correct Answer: D
Solution :
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