Which of the following compounds has ionic bond. `pi-`bond, co-ordinate bond and covalent bond:-

Options

A. `HNO_(2)`
B. `NaNO_(3)`
C. `KNO_(2)`
D. `MgCl_(2)`

Answer

To determine which compound has ionic bonds, pi bonds, coordinate bonds, and covalent bonds, we will analyze the compound sodium nitrate (NaNO3) step by step.

### Step-by-Step Solution:

1. **Identify the Compound**:
We are analyzing sodium nitrate (NaNO3).

**Hint**: Look for a compound that contains both a metal and a polyatomic ion.

2. **Determine the Type of Bonding**:
- Sodium (Na) is a metal and forms a cation (Na⁺).
- Nitrate (NO3⁻) is a polyatomic ion that acts as an anion.

**Hint**: Metals typically form ionic bonds with nonmetals or polyatomic ions.

3. **Ionic Bond**:
The bond between Na⁺ and NO3⁻ is an ionic bond. This occurs due to the electrostatic attraction between the positively charged sodium ion and the negatively charged nitrate ion.

**Hint**: Ionic bonds are formed when electrons are transferred from one atom to another.

4. **Analyze the Nitrate Ion (NO3⁻)**:
The nitrate ion consists of one nitrogen atom and three oxygen atoms. The bonding within the nitrate ion involves:
- One nitrogen-oxygen double bond (which includes a pi bond).
- One nitrogen-oxygen single bond.
- One nitrogen-oxygen bond formed by coordinate bonding.

**Hint**: Look for different types of bonds within the polyatomic ion.

5. **Identify the Pi Bond**:
The double bond between nitrogen and one of the oxygen atoms contains a pi bond. A pi bond is formed when two p-orbitals overlap sideways.

**Hint**: Double bonds consist of one sigma bond and one pi bond.

6. **Identify the Coordinate Bond**:
In the nitrate ion, one of the nitrogen-oxygen bonds is a coordinate bond where both electrons in the bond are provided by the nitrogen atom. This bond can be represented with an arrow pointing from nitrogen to oxygen.

**Hint**: Coordinate bonds are formed when one atom donates both electrons to the bond.

7. **Identify the Covalent Bonds**:
The other bonds in the nitrate ion (the double bond and the single bond) are covalent bonds, where electrons are shared between nitrogen and oxygen.

**Hint**: Covalent bonds are formed by the sharing of electron pairs between atoms.

8. **Conclusion**:
Sodium nitrate (NaNO3) contains:
- An ionic bond between Na⁺ and NO3⁻.
- A pi bond in the nitrogen-oxygen double bond.
- A coordinate bond in the nitrogen-oxygen bond where nitrogen donates both electrons.
- Covalent bonds in the remaining nitrogen-oxygen bonds.

Therefore, the compound that has ionic bonds, pi bonds, coordinate bonds, and covalent bonds is sodium nitrate (NaNO3).

### Final Answer:
The compound that has all four types of bonds (ionic, pi, coordinate, and covalent) is sodium nitrate (NaNO3).

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