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Isoelectronic species N₂, CO and NO⁺ all have a bond order of:

A2.5
B3
C2
D1
Answer & Solution
Correct answer: B. 3
All three have 10 valence electrons distributed identically — they are isoelectronic and isovalent, with bond order **3** (a triple bond). F₂ and O₂²⁻ similarly share bond order 1.
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