Boiling point of phosphine is higher than that of ammonia.

Explanation

To analyze the statement "Boiling point of phosphine is higher than that of ammonia," we need to consider the molecular structure and intermolecular forces present in both compounds.

### Step-by-Step Solution:

1. **Understanding the Compounds**:
- Ammonia (NH₃) and phosphine (PH₃) are both hydrides of nitrogen and phosphorus, respectively. They are similar in structure but differ in their intermolecular forces.

2. **Intermolecular Forces**:
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