Consider the following Statement-I : During isothermal expansion of an ideal gas its enthalpy decreases. Statement-II : When 2.0 L of an ideal gas expands isothermally into vaccum, $\Delta \mathrm{U}=0$. The correct answer is

• A

  Both statement-I and statement-II are correct
• B

  Both statement-I and statement-II are not correct
• C

  Statement-I is correct, but statement-II is not correct
• Correct answer
  D

  Statement-I is not correct, but statement-II is correct

Hence, the correct answer is option: 'D'.