To determine the types of bonds present in \( \text{N}_2\text{O}_5 \) (dinitrogen pentoxide), let's analyze its molecular structure and bonding:
### 1. Molecular Structure:
- The molecular formula \( \text{N}_2\text{O}_5 \) indicates that the molecule consists of two nitrogen (N) atoms and five oxygen (O) atoms.
- In \( \text{N}_2\text{O}_5 \), nitrogen and oxygen both are nonmetals.
### 2. Types of Bonds:
- **Covalent Bonds:** These bonds are formed when two nonmetals share electrons. In \( \text{N}_2\text{O}_5 \), nitrogen and oxygen share electrons to form covalent bonds.
- **Coordinate Covalent Bonds:** This type of covalent bond occurs when one atom provides both electrons for the bond. In \( \text{N}_2\text{O}_5 \), there are nitrogen-oxygen bonds where nitrogen shares electrons with oxygen, and it can also involve coordinate bonding where oxygen donates a lone pair to nitrogen.
### 3. Ionic Bonds:
- Ionic bonds are formed between metals and nonmetals, where electrons are transferred from one atom to another. Since both nitrogen and oxygen are nonmetals in this compound, ionic bonding is not present.
### Conclusion:
Given the above analysis, the bonds in \( \text{N}_2\text{O}_5 \) can be classified as **covalent and coordinate covalent** due to the sharing of electrons between nitrogen and oxygen and the possibility of coordinate bonding.
### Answer:
**B. Covalent and coordinate**