Which statement is incorrect?
Correct answer: D. In an isothermal process, △Q = 0
- A. In an isobaric process, △P = 0
- B. In an isochoric process, △W = 0
- C. In an isothermal process △T = 0
- D. In an isothermal process, △Q = 0
Explanation
A is correct because, in an isobaric process, the pressure of the system remains constant.B is correct because, in an isochoric process, the volume remains constant; therefore, no work is done by the system.C is correct because in an isothermal process, the temperature of the system remains constant. The transfer of heat into or out of the system happens so slowly that thermal equilibrium is maintained and T = 0.D is incorrect because the net heat flow into the system (Q) is not zero in an isothermal process.In an adiabatic process, there is no transfer of heat into or out of the system. (Q = 0)
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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