MCQMediumJEE Main 2026 · 28 January, Shift 1Internal Energy & Enthalpy

Chemistry Question from JEE Main 2026 · 28 January, Shift 1

20.0 dm320.0\,dm^3 of an ideal gas XX at 600 K600\,\text{K} and 0.5 MPa0.5\,\text{MPa} undergoes isothermal reversible expansion until the pressure of the gas becomes 0.2 MPa0.2\,\text{MPa}. Which of the following option is correct? (Given: log⁡2=0.3010\log 2 = 0.3010, log⁡5=0.6989\log 5 = 0.6989)

  • A

    w=−3.9 kJ, ΔU=0, ΔH=0, q=3.9 kJw=-3.9\,\text{kJ},\ \Delta U=0,\ \Delta H=0,\ q=3.9\,\text{kJ}

  • B

    w=9.1 kJ, ΔU=9.1 kJ, ΔH=0, q=0w=9.1\,\text{kJ},\ \Delta U=9.1\,\text{kJ},\ \Delta H=0,\ q=0

  • C

    w=−9.1 kJ, ΔU=0, ΔH=0, q=9.1 kJw=-9.1\,\text{kJ},\ \Delta U=0,\ \Delta H=0,\ q=9.1\,\text{kJ}

  • D

    w=+4.1 kJ, ΔU=0, ΔH=0, q=−4.1 kJw=+4.1\,\text{kJ},\ \Delta U=0,\ \Delta H=0,\ q=-4.1\,\text{kJ}

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