Chemistry · 2026
JEE Main · 24 January 2026, Shift 2 · Q56
Two liquids A and B form an ideal solution at temperature T K. At T K, the vapour pressures of pure A and B are 55 and 15 kN m^-2 respectively. What…
Two liquids A and B form an ideal solution at temperature T K . At T K , the vapour pressures of pure A and B are $\displaystyle 55$ and $\displaystyle 15 \mathrm{kN} \mathrm{m}^{-2}$ respectively. What is the mole fraction of A in solution of A and B in equilibrium with a vapour in which the mole fraction of A is $\displaystyle 0.8$?
Official answer
From NTA’s final answer key for this paper.
(1)
$\displaystyle 0.5217$
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JEE Main 2026 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.