$A$ solution has a $1:4$ mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at $20 \ ^oC$ are $440 \ mm \ Hg$ for pentane and $120 \ mm \ Hg$ for hexane. The mole fraction of pentane in the vapour phase would be
- A$0.549$
- B$0.2$
- C$0.786$
- D$0.478$
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Similar Questions
$A$ solution of urea (molar mass $60 \ g \ mol^{-1}$) boils at $100.20^{\circ}C$ at atmospheric pressure. If $K_{f}$ and $K_{b}$ for water are $1.86$ and $0.512 \ K \ kg \ mol^{-1}$ respectively,the freezing point of the solution will be:
$A$ Beckmann thermometer is used to measure:
Easy
View SolutionMatch List-$I$ with List-$II$
List-$I$ List-$II$ $A$. Solution of chloroform and acetone $I$. Minimum boiling azeotrope $B$. Solution of ethanol and water $II$. Dimerizes $C$. Solution of benzene and toluene $III$. Maximum boiling azeotrope $D$. Solution of acetic acid in benzene $IV$. $\Delta V_{mix}=0$
Choose the correct answer from the options given below $:$
| List-$I$ | List-$II$ |
| $A$. Solution of chloroform and acetone | $I$. Minimum boiling azeotrope |
| $B$. Solution of ethanol and water | $II$. Dimerizes |
| $C$. Solution of benzene and toluene | $III$. Maximum boiling azeotrope |
| $D$. Solution of acetic acid in benzene | $IV$. $\Delta V_{mix}=0$ |
Choose the correct answer from the options given below $:$
An aqueous solution of $NaCl$ shows the depression of freezing point of water equal to $0.372 \, K$. The boiling point of $BaCl_2$ solution of same molality will be .........$^oC$. $[K_f(H_2O) = 1.86 \, K \, kg \, mol^{-1}; K_b(H_2O) = 0.52 \, K \, kg \, mol^{-1}]$
MediumAIIMS 2011
View SolutionElevation in boiling point for $1.5 \, m$ solution of glucose in water is $4 \, K$. The depression in freezing point for $4.5 \, m$ solution of glucose in water is $4 \, K$. The ratio of molal elevation constant to molal depression constant $(K_{b} / K_{f})$ is $....$
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