Select the correct statement(s) — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

A reversible process strictly operates dynamically at equilibrium without creating net disorder, hence $\Delta S_{\text{universe}} = 0$. For an isolated system, no heat exchange occurs with the surroundings ($q_{rev}=0$), meaning $\Delta S_{\text{sys}}$ must also be exactly zero for reversibility.