(D) For elevation in boiling point: $\Delta T_b = K_b \times m$. Given $\Delta T_b = 2 \ K$ and $m = 1 \ m$,so $2 = K_b \times 1$,which gives $K_b = 2

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(D) For elevation in boiling point: $\Delta T_b = K_b \times m$. Given $\Delta T_b = 2 \ K$ and $m = 1 \ m$,so $2 = K_b \times 1$,which gives $K_b = 2 \ K \ kg \ mol^{-1}$. For depression in freezing point: $\Delta T_f = K_f \times m$. Given $\Delta T_f = 2 \ K$ and $m = 2 \ m$,so $2 = K_f \times 2$,which gives $K_f = 1 \ K \ kg \ mol^{-1}$. Comparing the two values,$K_b = 2 \ K_f$.

Class 12 Chemistry Solutions Mix Examples of Solutions

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Elevation in the boiling point for $1 \ m$ solution of glucose is $2 \ K$. The depression in the freezing point for $2 \ m$ solution of glucose in the same solvent is $2 \ K$. The relation between $K_b$ and $K_f$ is

JEE MAIN 2019 All JEE MAIN

A
$K_b = 1.5 K_f$
B
$K_b = K_f$
C
$K_b = 0.5 K_f$
D
$K_b = 2 K_f$

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If the mole fraction of the solvent decreases while preparing a solution,then ...........

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An aqueous solution of urea (molar mass $= 60 \ g \ mol^{-1}$) boils at $100.18^o C$ at atmospheric pressure. If $K_f = 1.86 \ K \ kg \ mol^{-1}$ and $K_b = 0.512 \ K \ kg \ mol^{-1}$ for water,then the freezing point of the solution is equal to ..... $^o C$.

Medium

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Match 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 $:$

MediumJEE MAIN 2025

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At $80\,^oC$,the vapour pressure of pure liquid $A$ is $520\, mm\,Hg$ and that of pure liquid $B$ is $1000\, mm\,Hg$. If a mixture of $A$ and $B$ boils at $80\,^oC$ and $1\, atm$ pressure,the amount of $A$ in the mixture is ........... $mol\,\%$.

Medium

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$1 \, \text{mole}$ of each of $A$ and $B$ form an ideal solution of vapour pressure $100 \, \text{mm Hg}$. Addition of $2 \, \text{moles}$ of $B$ to it decreases the vapour pressure by $20 \, \text{mm Hg}$. The vapour pressure of $A$ and $B$ in pure state are,respectively:

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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	$IV$. $\Delta V_{mix}=0$

Elevation in the boiling point for $1 \ m$ solution of glucose is $2 \ K$. The depression in the freezing point for $2 \ m$ solution of glucose in the same solvent is $2 \ K$. The relation between $K_b$ and $K_f$ is

Similar Questions

If the mole fraction of the solvent decreases while preparing a solution,then ...........

An aqueous solution of urea (molar mass $= 60 \ g \ mol^{-1}$) boils at $100.18^o C$ at atmospheric pressure. If $K_f = 1.86 \ K \ kg \ mol^{-1}$ and $K_b = 0.512 \ K \ kg \ mol^{-1}$ for water,then the freezing point of the solution is equal to ..... $^o C$.

At $80\,^oC$,the vapour pressure of pure liquid $A$ is $520\, mm\,Hg$ and that of pure liquid $B$ is $1000\, mm\,Hg$. If a mixture of $A$ and $B$ boils at $80\,^oC$ and $1\, atm$ pressure,the amount of $A$ in the mixture is ........... $mol\,\%$.

$1 \, \text{mole}$ of each of $A$ and $B$ form an ideal solution of vapour pressure $100 \, \text{mm Hg}$. Addition of $2 \, \text{moles}$ of $B$ to it decreases the vapour pressure by $20 \, \text{mm Hg}$. The vapour pressure of $A$ and $B$ in pure state are,respectively:

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