The number of molecules from the following which contain only two lone pairs of electrons is

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Canvas Classes · Accepted Answer

Step 1 — Count total lone pairs in each molecule:

| Molecule | Lone pairs (all atoms) | Only 2 total? |
|----------|----------------------|---------------|
|  | O has 2 lone pairs; H has 0 → 2 total ✓ |
|  | Each N has 1 lone pair → 2 total ✓ |
| CO | C has 1 lone pair, O has 2 → 3 total ✗ |
|  | Xe has 2 + each F has 3 → many ✗ |
|  | N has 1 lone pair; H has 0 → 1 total ✗ |
| NO | N has 1 (odd e⁻), O has 2 → ~3 ✗ |
|  | Each O has 2 lone pairs → 4 total ✗ |
|  | Each F has 3 lone pairs → 6 to

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