Among the following species, the diamagnetic molecule is:

Question

Canvas Classes · Accepted Answer

Diamagnetic = all electrons paired (no unpaired electrons).

Step 1 — Check each species:

| Species | e⁻ | Unpaired e⁻ | Magnetic |
|---------|-----|------------|----------|
| CO | 14 | 0 (isoelectronic with N₂) | Diamagnetic ✓ |
|  | 10 | 2 (in degenerate π) | Paramagnetic |
|  | 16 | 2 (in π) | Paramagnetic |
| NO | 11 | 1 (odd e⁻) | Paramagnetic |

Answer: Option (1) — CO

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