During the isothermal of an ideal gas :

(A) : During change of state of a substance internal energy of a substance remains constant (R) : During isothermal process of an ideal gas change in internal energy is zero

During the isothermal expansion of an ideal gas:

During the isothermal expansion of an ideal gas

During isothermal expansion of an ideal gas its

During isothermal expansion of an ideal gas, its:

During isothermal expansion of an ideal gas its