Which one of the following constitutes a group of the
isoelectronic species?
(a) C₂²⁻ ,O₂⁻ ,CO,NO
(b) NO⁺ ,C₂²⁻ ,CN⁻ ,N₂
(c) CN⁻ ,N₂,O₂²⁻ ,C₂²⁻
(d) N₂ ,O₂ ,NO⁻ ,CO
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Answer:
Options A is correct answer
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