Which of the following represents the conjugate pair of `NH_(3)`?

Options

A. `NH_(2)^(Theta)`
B. `NH_(4)^(o+)`
C. Both (a) and (b)
D. `N^(3-)`

Explanation

To find the conjugate pair of NH₃ (ammonia), we need to understand the concept of conjugate acid-base pairs. A conjugate acid-base pair consists of two species that differ by one proton (H⁺).

### Step-by-Step Solution:

1. **Identify NH₃ as a Base**:
- NH₃ can act as a base because it can accept a proton (H⁺).
- When NH₃ accepts a proton, it becomes NH₄⁺ (ammonium ion).

2. **Determine the Conjugate Acid**:
- The conjugate acid of NH₃ is formed by adding a proton (H⁺) to it.
- Therefore, NH₃ + H⁺ → NH₄⁺.
- Thus, NH₄⁺ is the conjugate acid of NH₃.

3. **Identify NH₃ as an Acid**:
- NH₃ can also act as an acid in some reactions by donating a proton.
- When NH₃ donates a proton, it becomes NH₂⁻ (amide ion).

4. **Determine the Conjugate Base**:
- The conjugate base of NH₃ is formed by removing a proton (H⁺) from it.
- Therefore, NH₃ - H⁺ → NH₂⁻.
- Thus, NH₂⁻ is the conjugate base of NH₃.

5. **Conclude the Conjugate Pair**:
- The conjugate acid-base pair for NH₃ is NH₄⁺ (conjugate acid) and NH₂⁻ (conjugate base).
- Both differ by one proton (H⁺).

### Final Answer:
The conjugate pair of NH₃ is NH₄⁺ (conjugate acid) and NH₂⁻ (conjugate base).

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