Practicing Success
In case of the following questions, a statement I is given followed by a corresponding statement II just below it. Mark the correct answer. Statement I: In irreversible processes changes are carried out through quasi-equilibrium state. Statement II: In reversible process changes are carried out so slowly that the system and surroundings are always in near equilibrium. |
If both statement I and statement II are true and statement II is the correct explanation of statement I. If both statement I and statement II are true and statement II is not the correct explanation of statement I. Statement I is true and statement II is false. Statement I is false and statement II is true. |
Statement I is false and statement II is true. |
The correct answer is option 4. Statement I is false and statement II is true. To understand the detailed explanation, let's break down each statement and the concepts involved. Statement I: In irreversible processes changes are carried out through quasi-equilibrium state. Irreversible Processes: Irreversible processes are those that cannot be reversed by infinitesimal changes in a variable. They occur spontaneously and involve non-equilibrium states. Characteristics: Finite Gradients: They typically involve finite differences in temperature, pressure, or concentration between the system and its surroundings, leading to rapid changes. Dissipation of Energy: These processes often result in the dissipation of energy as heat or work (e.g., friction, turbulence). Non-equilibrium States: The system is not in equilibrium at all stages of the process. Quasi-equilibrium State: A quasi-equilibrium (or quasi-static) state is one where the process occurs infinitesimally slowly, allowing the system to pass through a continuous series of equilibrium states. Characteristics: Near-Equilibrium: The system is always infinitesimally close to equilibrium. Infinitesimal Changes: Changes occur so slowly that the system has enough time to adjust to the surroundings, maintaining near-equilibrium conditions. Statement II: In reversible processes changes are carried out so slowly that the system and surroundings are always in near equilibrium. Reversible Processes: Reversible processes are idealized processes that can be reversed without leaving any change in both the system and the surroundings. Characteristics: Infinitesimal Changes: Changes occur extremely slowly, allowing the system and surroundings to adjust continuously. Continuous Equilibrium: The system passes through an infinite number of equilibrium states, ensuring that the process is quasi-static. No Dissipation: There is no loss of energy due to irreversibilities like friction or turbulence. Since reversible processes involve infinitesimally slow changes that keep the system and surroundings in near-equilibrium, Statement II is true. Summary: Irreversible Processes: Rapid changes, non-equilibrium states, energy dissipation. Reversible Processes: Infinitesimally slow changes, continuous equilibrium states, no energy dissipation Conclusion: Based on the definitions and characteristics: Statement I is false because irreversible processes do not maintain quasi-equilibrium states. Statement II is true because reversible processes are characterized by infinitesimally slow changes that maintain near-equilibrium. |