Which one of the following constitutes a group of isoelectronic species? - Chemistry MCQ AIEEE 2026 | ExamTest.live | ExamTest.live

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Which one of the following constitutes a group of isoelectronic species?

A $C_{2}^{2 -}, O_{2}^{-}, CO, NO$
B $NO^{+}, C_{2}^{2 -}, CN^{-}, N_{2}$
C $CN^{-}, N_{2}, O_{2}^{2 -}, C_{2}^{2 -}$
D $N_{2}, O_{2}^{-}, NO^{+}, CO$

Solution & Step-by-step Explanation

Isoelectronic species have the same total number of electrons.Total electrons: NO^{+} = 7 + 8 - 1 = 14 C_{2}^{2 -} = 2 (6) + 2 = 14 CN^{-} = 6 + 7 + 1 = 14 N_{2} = 2 (7) = 14 All species in option B have 14 electrons.

Practice this question

Try it yourself before checking the explanation above.

Which one of the following constitutes a group of isoelectronic species?

A

C_{2}^{2 -}, O_{2}^{-}, CO, NO

B

NO^{+}, C_{2}^{2 -}, CN^{-}, N_{2}

C

CN^{-}, N_{2}, O_{2}^{2 -}, C_{2}^{2 -}

D

N_{2}, O_{2}^{-}, NO^{+}, CO

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atomic structure isoelectronic species

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