Question bank/NEET UG/Chemistry

NEET UGChemistryModerateRe-NEET 2026

Two moles of an ideal gas undergo free expansion from 10 L to 100 L at 300 K. The values of ΔSsystem\Delta S_{system} and ΔSsurroundings\Delta S_{surroundings} are
(R is universal gas constant)

Show answer and solution
Sol. During free expansion
ΔSsystem=nRln⁡V2V1\Delta S_{system} = nR \ln \frac{V_2}{V_1}
=2.303×2×R×log⁡10010= 2.303 \times 2 \times R \times \log \frac{100}{10}
=4.606R= 4.606 R
ΔSsurroundings=0\Delta S_{surroundings} = 0 as q = 0

Source: geekyrakshit/indian-exam-questions / reneet2026-code50

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