`NH_(3)` does not contain hydroxyl group , then why is it a base ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Definition of a Base**:
- A base is generally defined as a substance that can accept protons (H⁺ ions) or donate electron pairs. There are different theories that explain what constitutes a base.

2. **Arrhenius Theory**:
- According to the Arrhenius theory, a base is a substance that can produce hydroxide ions (OH⁻) when dissolved in water. Typically, bases contain hydroxyl groups (-OH).

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