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Comprehension
: On mixing two components A and \( B \) to form a non-ideal solution, final solution becomes cold. ( \( F= \) intermolecular force of attraction).
\( 0.5 \mathrm{M}, 100 \mathrm{~mL} \) A and \( 0.2 \mathrm{M}, 500 \mathrm{~mL} \mathrm{~B} \) are mixed at \( 27^{\circ} \mathrm{C} \). Vapour pressure of pure A and pure B is \( 200 \mathrm{~mm} \mathrm{Hg} \) and \( 50 \mathrm{~mm} \mathrm{Hg} \) respectively at \( 27^{\circ} \mathrm{C} \). The ratio of partial pressures of \( \mathrm{A} \) and \( \mathrm{B} \) (in vapour phase) after mixing is
(a) \( 2: 1 \)
(b) \( 1: 2 \)
(c) \( 2: 3 \)
(d) \( 4: 1 \)
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