48. (a) U.UUUT M Solution (DJ U.UU1...
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48. (a) U.UUUT M Solution (DJ U.UU1 m solution (C) 0.01 M JURULU Moles of Na2SO4 to be dissolved in 12 mole water to lower its vapour pressure by 10 mm Hg at a temperature at which vapour pressure of pure water is 50 mm is: (a) 1.5 mole (b) 2 mole (c) 1 mole (d) 3 mole

JEE/Engineering Exams
Chemistry
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Let Ruative loweriong of Vapor pressure ( =frac{Delta P}{p}=X_{B} quad i=V_{operatorname{ant}} sigma_{1} operatorname{tac} theta ) ( Rightarrow frac{Delta p}{p}=frac{i n_{B}}{i n_{B}+n_{A}} cdot N alpha_{2} operatorname{sog}(i=3) ) ( Rightarrow frac{10}{50}=frac{3 n_{B}}{3 n_{B}+R} quad mid begin{array}{c}Delta p=10 p=50 n_{A}=12end{array} ) ( Rightarrow quad 3 n_{B}+12=15 n_{B} ) [ 12=12 n_{B} ] ( Rightarrow quad x_{B}=mid ) moles (C) Imole
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