For an ideal gas, in an isothermal process:

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(C) An isothermal process is defined as a thermodynamic process in which the temperature of the system remains constant throughout the process $(T = \

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Temperature remains constant

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(C) An isothermal process is defined as a thermodynamic process in which the temperature of the system remains constant throughout the process $(T = 	ext{constant})$.For an ideal gas, the internal energy $U$ is a function of temperature only $(U = f(T))$.Since the temperature remains constant in an isothermal process, the internal energy of the ideal gas also remains constant $(\Delta U = 0)$.Therefore, option $(C)$ is the correct statement.

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