P and Q combines to form two compounds {\PQ}_2 and {\PQ}_3. If 1 g PQ 2 is dissolved in 51 g benzene the depression of freezing point becomes 0 \cdot 8^{\circ} {\C}. On the other hand if 1 {\g} {\PQ}{ }_3 is dissolved in 51 g of benzene, the depression of freezing point becomes 0.625^{\circ} {\C}. The atomic mass of P and Q are ( K_f of benzene =5 \cdot 1 {\K} {\kg} {\mol}^{-1} )

WBJEE 2025 Physics and Chemistry Papers

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P and Q combines to form two compounds PQ2 and PQ3. If 1 g PQ 2 is dissolved in 51 g benzene the depression of freezing point becomes 0⋅8∘C. On the other hand if 1g‌PQ‌‌3 is dissolved in 51 g of benzene, the depression of freezing point becomes 0.625∘C. The atomic mass of P and Q are ( Kf of benzene =5⋅1K‌kg‌mol−1 )

35,55
45,45
55,45
55,35

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