Chemistry · 2020
JEE Main · 9 January 2020, Shift 2 · Q46
A cylinder containing an ideal gas (0.1 mol of 1.0 dm^3 ) is in thermal equilibrium with a large volume of 0.5 molal aqueous solution of ethylene…
A cylinder containing an ideal gas ($\displaystyle 0.1$ mol of $\displaystyle 1.0 \mathrm{dm}^3$ ) is in thermal equilibrium with a large volume of $\displaystyle 0.5$ molal aqueous solution of ethylene glycol at its freezing point. If the stoppers $\displaystyle \mathrm{S}_1$ and $\displaystyle \mathrm{S}_2$ (as shown in the figure) are suddenly withdrawn, the volume of the gas in litres after equilibrium is achieved will be \_\_\_\_.
(Given, $\displaystyle \mathrm{K}_f$ (water) $\displaystyle =2.0 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$, $\displaystyle \mathrm{R}=0.08 \mathrm{dm}^3 \mathrm{~atm} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$ )

Official answer
2.2 ± 0.03
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JEE Main 2020 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.