Assertion: Thermodynamics process in nature are irreversible.
Reason: Dissipative effects cannot be eliminated.

Options

A. Both assertion and reason are true and reason is the correct explanation of assertion
B. Both assertion and reason are true but reason is not the correct explanation of assertion
C. Assertion is true but reason is false
D. Both assertion and reason are false.

Explanation

To solve the question regarding the assertion and reason in thermodynamics, we will analyze both statements step by step.

### Step 1: Understand the Assertion
The assertion states that "thermodynamic processes in nature are irreversible."

- **Explanation**: In thermodynamics, a process is considered irreversible if it cannot return both the system and the surroundings to their original states after the process has occurred. This is a fundamental concept in thermodynamics, as most natural processes (like mixing of gases, heat transfer, etc.) do not allow for a complete return to the initial conditions.

### Step 2: Understand the Reason
The reason provided is "dissipative effects cannot be eliminated."

- **Explanation**: Dissipative effects refer to energy losses in a system due to factors like friction, turbulence, and other forms of resistance. These effects lead to the degradation of energy, making it impossible to fully recover the original state of the system and surroundings. Since these dissipative effects are inherent in natural processes, they contribute to the irreversibility of thermodynamic processes.

### Step 3: Connect the Assertion and Reason
Now, we need to determine if the reason correctly explains the assertion.

- The assertion is true because all natural thermodynamic processes are indeed irreversible.
- The reason is also true because dissipative effects, which include friction and other energy losses, cannot be eliminated and are responsible for the irreversibility of these processes.

### Step 4: Conclusion
Since both the assertion and reason are true, and the reason provides a correct explanation for the assertion, we conclude that:

- **Final Answer**: Both the assertion and reason are true, and the reason is the correct explanation of the assertion.