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The pair of species that has the same bond order in the following is:

1. O2, B2
2. CO, NO+
3. NO+, CN−
4. O2, N2

Correct answer: CO, NO+

Solution

CO and NO+ both have a bond order of 3, as determined by molecular orbital theory. CO has 10 valence electrons, and NO+ also has 10 valence electrons, leading to the same bond order.

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