Arrange the following in decreasing order of basic strength of 15 group hydrides

Explanation

To arrange the hydrides of group 15 elements (the nitrogen family) in decreasing order of basic strength, we will consider the following hydrides: 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, PH₃, AsH₃, SbH₃, and BiH₃.

2. **Understand Basic Strength**: Basic strength refers to the ability of a compound to accept protons (H⁺ ions). The stronger the base, the more readily it accepts protons.

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