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Among the following groupings , which on...

Among the following groupings , which one represents the set of iso-electronic species?

A

`NO^(+),C_2^(2-), O_2^(-), CO`

B

`N_2,C_2^(2-),CO,NO`

C

`CO,NO^(+),CN^(-),C_2^(2-)`

D

`NO,CN^(-),N_2,O_2`

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