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NEET Chemistry Thermodynamics / रासायनिक उष्मागतिकी NEET PYQ-Thermodynamics

  • question_answer
    Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is [Given that 1 L bar = 100 J]                                            [NEET 2019]

    A)  25 J                

    B)       30 J

    C)  -30 J   

    D)       5 kJ

    Correct Answer: C

    Solution :

    [c] Thermodynamics
    \[W={{P}_{ext}}\Delta V\]
    = -2(bar) (0.15 L)
    = -0.3 bar:
    = -0.3 × 100 J
    = - 30 J


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