In the conversion of ammonia ammonium ion the bond formed `NH_(3)` and hydrogen ion is

Options

A. covalent bond
B. co-ordinate covalent bond
C. electrovalent bond
D. None of these

Answer

To solve the question regarding the bond formed between ammonia (NH₃) and a hydrogen ion (H⁺) in the conversion to the ammonium ion (NH₄⁺), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Reactants and Products**:
- We start with ammonia (NH₃) and a hydrogen ion (H⁺).
- The product of this reaction is the ammonium ion (NH₄⁺).

2. **Identify the Structure of Ammonia**:
- Ammonia (NH₃) has a pyramidal structure with nitrogen at the center and three hydrogen atoms bonded to it.
- Nitrogen has one lone pair of electrons.

3. **Determine the Interaction with the Hydrogen Ion**:
- The hydrogen ion (H⁺) is essentially a proton that lacks electrons.
- In the reaction, the hydrogen ion will interact with the lone pair of electrons on the nitrogen atom in ammonia.

4. **Bond Formation**:
- When H⁺ approaches NH₃, it can accept the lone pair of electrons from nitrogen.
- This results in the formation of a new bond between nitrogen and the hydrogen ion.

5. **Type of Bond Formed**:
- The bond formed in this process is a coordinate covalent bond (also known as a dative bond).
- In this type of bond, one atom (in this case, nitrogen) donates both electrons to form the bond with the hydrogen ion.

6. **Conclusion**:
- Therefore, the bond formed between ammonia (NH₃) and the hydrogen ion (H⁺) to create the ammonium ion (NH₄⁺) is a coordinate covalent bond.

### Final Answer:
The bond formed between NH₃ and H⁺ is a **coordinate covalent bond** (Option B).