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In thermodynamics, a process is called r...

In thermodynamics, a process is called reversible when

A

surrounding and system change are same

B

there is no boundary between system and surrounding

C

surrounding is always in equilibrium with system

D

system change into surrounding spontaneously:

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### Step-by-Step Solution: 1. **Understanding the Question**: The question asks for the definition of a reversible process in thermodynamics. A reversible process is a theoretical concept that describes a process that can be reversed without leaving any trace on the surroundings. 2. **Definition of Reversible Process**: A reversible process occurs when a system and its surroundings are in a state of equilibrium throughout the process. This means that the system can be returned to its original state without any net change in the system or the surroundings. 3. **Equilibrium Condition**: For a process to be reversible, it must maintain equilibrium between the system and the surroundings at all times. This implies that any change in the system must be infinitesimally small, allowing the system to adjust and return to its original state without any energy loss or increase in entropy. 4. **Analyzing Options**: - **Option A**: "Surrounding and system changes are the same" - This is incorrect because it does not capture the essence of equilibrium. - **Option B**: "System changes into surrounding spontaneously" - This is also incorrect as it implies a spontaneous process, which is not reversible. - **Option C**: "Surrounding is always in equilibrium with the system" - This is the correct option because it aligns with the definition of a reversible process. 5. **Conclusion**: The correct answer is that a process is called reversible when there is equilibrium between the system and the surroundings throughout the process.
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