Chemistry · 2026
JEE Main · 28 January 2026, Shift 1 · Q54
20.0 dm^3 of an ideal gas ' X ' at 600 K and 0.5 MPa undergoes isothermal reversible expansion until pressure of the gas is 0.2 MPa. Which of the…
$\displaystyle 20.0 \mathrm{dm}^3$ of an ideal gas ' X ' at $\displaystyle 600$ K and $\displaystyle 0.5$ MPa undergoes isothermal reversible expansion until pressure of the gas is $\displaystyle 0.2$ MPa . Which of the following option is correct?
(Given: $\displaystyle \log 2=0.3010$ and $\displaystyle \log 5=0.6989$ )
Official answer
From NTA’s final answer key for this paper.
(4)
$\displaystyle \mathrm{w}=-9.1 \mathrm{~kJ}, \Delta \mathrm{U}=0, \Delta \mathrm{H}=0, \mathrm{q}=9.1 \mathrm{~kJ}$
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JEE Main 2026 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.