Which basis class of molecular hydrides act as lewis bases?

Explanation

To determine which class of molecular hydrides acts as Lewis bases, we need to understand the definition of a Lewis base and the characteristics of molecular hydrides.

### Step-by-Step Solution:

1. **Understanding Lewis Bases**:
- A Lewis base is defined as a substance that can donate a pair of electrons to form a covalent bond. This means that Lewis bases must have lone pairs of electrons available for donation.

2. **Identifying Molecular Hydrides**:
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