JEE Main 2008Annual, Paper 1ChemistryHardAtomic Structure113× since 2002Which one of the following constitutes a group of the isoelectronic species?AOption A. C22−C_2^{2 - }C22−, O2−O_2^{-}O2−, CO, NOBOption B. NO+NO^{+}NO+, C22−C_2^{2 - }C22−, CN⁻, N2N_2N2COption C. CN⁻, N2N_2N2, O22−O_2^{2-}O22−, C22−C_2^{2 - }C22−DOption D. N2N_2N2, O2−O_2^{-}O2−, NO+NO^{+}NO+, COCheckSkip · show solution
