Among the hydrides of group 15 elements which has highest boiling point?

Explanation

To determine which hydride of the group 15 elements has the highest boiling point, we will analyze the hydrides of the elements in this group: nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The hydrides formed by these elements are NH3 (ammonia), PH3 (phosphine), AsH3 (arsine), SbH3 (stibine), and BiH3 (bismuthine).

### Step-by-Step Solution:

1. **Identify the Hydrides**:
- The hydrides of group 15 elements are:
- NH3 (Ammonia)
- PH3 (Phosphine)
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