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Five moles of an ideal gas is expanded i...

Five moles of an ideal gas is expanded isothermally from 5dm³ to 5m² at 300 K Which of the following is incorrect about the gas ?
1 ) No heat is absorbed ( or ) reject by the gas 2 ) There is no change in internal energy of the gas 3 ) There is no change in enthalpy of the gas 4 ) Pressure of the gas will be decrease by 1000 times

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