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(D) In an isothermal process,the temperature $T$ of the system remains constant.According to the ideal gas law,$PV = nRT$. Since $T$ is constant,the p

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All the above may change

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(D) In an isothermal process,the temperature $T$ of the system remains constant.According to the ideal gas law,$PV = nRT$. Since $T$ is constant,the product $PV$ remains constant,but $P$ and $V$ individually can change.Entropy $(S)$ is a state function that depends on temperature and volume/pressure. For an ideal gas,$\Delta S = nR \ln(V_f/V_i)$. If the volume changes,entropy changes.Heat exchanged $(Q)$ with the system is given by $Q = W = nRT \ln(V_f/V_i)$. If the volume changes,the heat exchanged is non-zero.Therefore,pressure,entropy,and heat exchanged are not necessarily fixed during an isothermal process.Thus,all the above quantities may change.

$A$ gas undergoes a change at constant temperature. Which of the following quantities remain fixed?

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