Question

Observe the following two statements: I. For an isolated system, \( \Delta U = 0 \); \( q = 0 \) II. For a closed system, \( \Delta U = 0 \); \( q \neq 0 \) The correct answer is

• A. Both statements I and II are correct
• B. Both statements I and II are not correct
• C. Statement I is correct but statement II is not correct
• D. Statement I is not correct but statement II is correct

Hint:

Remember, an isolated system has no energy exchange, while a closed system allows energy exchange but not matter exchange.

Answer 1

The Correct Option is A

- For an isolated system, no heat or work is exchanged with the surroundings, so the change in internal energy \( \Delta U = 0 \), and \( q = 0 \). - For a closed system, the system exchanges energy with the surroundings in the form of heat, but the total energy change is still zero, so \( \Delta U = 0 \), but \( q \neq 0 \) due to the heat transfer. Thus, both statements are correct.