Q20 / 150 · MHT CET 2026 (11 April Shift 1) · Chemistry
Which of the following processes exhibits, $\Delta U = 0$?
- AAdiabatic process
- Correct answerBIsothermal process
- CIsobaric process
- DIsochoric process
Solution
The internal energy of an ideal gas is a function of temperature only.
The change in internal energy is given by $\Delta U = n C_v \Delta T$.
In an isothermal process, the temperature of the system remains constant, which implies $\Delta T = 0$.
Substituting $\Delta T = 0$ yields $\Delta U = 0$.
Therefore, an isothermal process exhibits $\Delta U = 0$.
Answer: Isothermal process
The change in internal energy is given by $\Delta U = n C_v \Delta T$.
In an isothermal process, the temperature of the system remains constant, which implies $\Delta T = 0$.
Substituting $\Delta T = 0$ yields $\Delta U = 0$.
Therefore, an isothermal process exhibits $\Delta U = 0$.
Answer: Isothermal process
Hence, the correct answer is option: 'B'.