AIIMS 2018 Chemistry Entropy and Volume Changes MCQ Question

In the described process AB, the temperature remains constant (isothermal) while the volume increases, indicating that work is done on or by the system without changing internal energy. In process BC, the entropy remains constant while the temperature decreases, suggesting an isentropic process where the volume increases due to the expansion of the gas, likely a real gas like CO₂. The other options are not applicable as they do not provide relevant information or context to the processes described. Understanding these thermodynamic principles helps clarify how different processes affect state variables like temperature, volume, and entropy in gases.