A) \[{{O}^{2-}}<{{N}^{3-}}<{{S}^{2-}}<{{P}^{3-}}\]
B) \[{{O}^{2-}}<{{P}^{3-}}<{{N}^{3-}}<{{S}^{2-}}\]
C) \[{{N}^{3}}<{{O}^{2-}}<{{P}^{3-}}<{{S}^{2-}}\]
D) \[{{N}^{3-}}<{{S}^{2-}}<{{O}^{2-}}<{{P}^{3-}}\]
Correct Answer: A
Solution :
[a] For isoelectronic species ionic radii decreases as the charge on ion decreases. Further on moving down in a group ionic radii increases. Hence the correct order is \[{{O}^{2-}}~<{{N}^{3-}}~<{{S}^{2-}}~<{{P}^{3-}}~\]
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