`Delat E and Delta H` both are zero in

Options

A. Isobaric process
B. Adiabatic process
C. Isochoric process
D. Cyclic process

Answer

To solve the question regarding when both ΔE (change in internal energy) and ΔH (change in enthalpy) are zero, we can analyze the different types of thermodynamic processes mentioned.

### Step-by-Step Solution:

1. **Understanding ΔE and ΔH**:
- ΔE represents the change in internal energy of a system.
- ΔH represents the change in enthalpy of a system.
- If both ΔE and ΔH are zero, it implies that there is no change in the internal energy or enthalpy of the system during the process.

2. **Identifying the Types of Processes**:
- **Isobaric Process**: A process that occurs at constant pressure. ΔH can change in this process if heat is added or removed.
- **Adiabatic Process**: A process where no heat is exchanged with the surroundings. ΔE can change due to work done on or by the system.
- **Isochoric Process**: A process that occurs at constant volume. ΔE can change if there is a change in temperature.
- **Cyclic Process**: A process where the system returns to its initial state. This means that the initial and final states are the same, leading to ΔE = 0 and ΔH = 0.

3. **Analyzing Each Process**:
- In an isobaric process, heat transfer can cause a change in enthalpy.
- In an adiabatic process, work done can change internal energy.
- In an isochoric process, if temperature changes, internal energy will change.
- In a cyclic process, since the system returns to its original state, both ΔE and ΔH will be zero.

4. **Conclusion**:
- The only process where both ΔE and ΔH are zero is the **cyclic process**. This is because the system undergoes a series of changes but ultimately returns to its initial state, resulting in no net change in energy or enthalpy.

### Final Answer:
The correct answer is **Cyclic Process**.

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