Of the following sets, which one does NOT contain isoelectronic species?

B O_{3}^{3 -}

C O_{3}^{2 -}

N O_{3}^{-}

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S O_{3}^{2 -}

C O_{3}^{2 -}

N O_{3}^{-}

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C N^{-}

N_{2}

C_{2}^{2 -}

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P O_{4}^{3 -}

S O_{4}^{2 -}

C l O_{4}^{-}

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Solution

The correct option is B $S O_{3}^{2 -}$ , $C O_{3}^{2 -}$ , $N O_{3}^{-}$
(A) $B O_{3}^{3 -}$ , $C O_{3}^{2 -}$ , $N O_{3}^{-}$ contains 32 electrons each. Hence, they are isoelectronic.

(B) $S O_{3}^{2 -}$ , contains 34 electrons. $C O_{3}^{2 -}$ contains 32 electrons and $N O_{3}^{-}$ contains 32 electrons. Thus, these species are not isoelectronic.

(C) $C N^{-}$ , $N_{2}$ , $C_{2}^{2 -}$ contains 14 electrons each. Hence, they are isoelectronic.

(D) $P O_{4}^{3 -}$ , $S O_{4}^{2 -}$ , $C l O_{4}^{-}$ contains 34 electrons.

Hence, they are isoelectronic.

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Which of the following, are isoelectronic and isostructural ?

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