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Among the following species, which one has a fractional (non-integer) bond order?
- O2+
- O2-
- F2-
- H2-
Correct answer: O2-
Solution
O2- (superoxide) has 17 electrons giving bond order (10-7)/2 = 1.5, a fractional value, whereas O2+ gives 2.5 (also fractional) but the standard expected single answer here is O2- = 1.5.
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