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Which one of the following arrangements represents the increasing bond orders of the given species?

1. NO+ < NO < NO− < O2−
2. O2− < NO− < NO < NO+
3. NO− < O2− < NO < NO+
4. NO < NO+ < O2− < NO−

Correct answer: O2− < NO− < NO < NO+

Solution

Bond order is determined by the molecular orbital theory. NO+ has the highest bond order (3), followed by NO (2.5), NO− (2), and O2− (1.5). Thus, the correct order is O2− < NO− < NO < NO+.

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