Assertion :There is no change in enthalpy of an ideal gas during compression at constant temperature. Reason: Enthalpy of an ideal gas is a function of temperature and pressure.
There is no change in enthalpy of an ideal gas during compression at constant temperature.Enthalpy of an ideal gas is a function of temperature and pressure.So both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Hence option S is correct.