Read the Assertion and Reason below and choose the correct option. — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

For an ideal gas expanding into a vacuum, external pressure is zero, so work done $W = 0$. Since it is isothermal, $\Delta U = 0$. By the first law, $q = \Delta U - W = 0$. Statement I is correct. Statement II is a correct postulate of the kinetic theory of gases but does not explain the macroscopic thermodynamic outcome of zero heat exchange.