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Chemistry · PYQ NEET UG 2019(1)
हिन्दीUnder isothermal condition, a gas at \( 300\text{ K} \) expands from \( 0.1\text{ L} \) to \( 0.25\text{ L} \) against a constant external pressure of \( 2\text{ bar} \). The work done by the gas is _________. (Given that \( 1\text{ L bar} = 100\text{ J} \))
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Correct answer · Option D
\( -30\text{ J} \)
Explanation
Work done \( W = -P_{\text{ext}}\Delta V = -2\text{ bar} \times (0.25 - 0.1)\text{ L} = -2 \times 0.15\text{ L bar} = -0.30\text{ L bar} = -0.30 \times 100\text{ J} = -30\text{ J} \).
