Which one of the following constitutes a...

Which one of the following constitutes a group of the 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-),CO_(2)^(2-)`

D

`N_(2),O_(2)^(-),NO^(+),CO`

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The correct Answer is:

B

Isoelectronic species have same number of electrons , `NO^(+) , C_(2)^(2-) , CN^(-)` and `N_(2)` all have 14 electrons.

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