What is true for a cyclic process

Options

A. W=0
B. `DeltaE=0`
C. `DeltaH=0`
D. `DeltaEne0`

Answer

To determine what is true for a cyclic process, we need to analyze the properties of such a process in thermodynamics.

### Step-by-Step Solution:

1. **Understanding the Cyclic Process**:
- A cyclic process is one where the system returns to its initial state after a series of changes. This means that all state functions (like internal energy, enthalpy, etc.) will have the same values at the beginning and end of the process.

2. **Work Done (W)**:
- In a cyclic process, the net work done is not necessarily zero. The system can do work on the surroundings or have work done on it, but the total work done over one complete cycle is zero when considering the system's internal energy. Therefore, the statement "W = 0" is incorrect.

3. **Change in Internal Energy (ΔE)**:
- The change in internal energy (ΔE) for a cyclic process is zero because the system returns to its initial state. Thus, the internal energy at the end of the cycle is the same as at the beginning. Therefore, ΔE = 0 is correct.

4. **Change in Enthalpy (ΔH)**:
- Similar to internal energy, the change in enthalpy (ΔH) for a cyclic process is also zero. Since enthalpy is a state function, and the system returns to its original state, ΔH = 0 is also correct.

5. **Conclusion**:
- From the analysis, we find that:
- W ≠ 0 (incorrect)
- ΔE = 0 (correct)
- ΔH = 0 (correct)
- ΔE ≠ 0 (incorrect)
- Therefore, the true statements for a cyclic process are that ΔE = 0 and ΔH = 0.

### Final Answer:
The true statements for a cyclic process are:
- ΔE = 0
- ΔH = 0