$1.22 \, g$ of an organic acid is separately dissolved in $100 \, g$ of benzene $(K_{b}=2.6 \, K \, kg \, mol^{-1})$ and $100 \, g$ of acetone $(K_{b}=1.7 \, K \, kg \, mol^{-1})$. The acid is known to dimerize in benzene but remain as a monomer in acetone. The boiling point of the solution in acetone increases by $0.17^{\circ} C$.
The increase in boiling point of solution in benzene in $^{\circ} C$ is $x \times 10^{-2}$. The value of $x$ is ..... .(Nearest integer)
$[$ Atomic mass : $C=12.0, H=1.0, O=16.0]$
The increase in boiling point of solution in benzene in $^{\circ} C$ is $x \times 10^{-2}$. The value of $x$ is ..... .(Nearest integer)
$[$ Atomic mass : $C=12.0, H=1.0, O=16.0]$
- A$12$
- B$13$
- C$10$
- D$11$
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Similar Questions
$A$ solution of urea (molar mass $60 \, g \, mol^{-1}$) boils at $100.18 \, ^oC$ at atmospheric pressure. If $K_f$ and $K_b$ for water are $1.86$ and $0.512 \, K \, kg \, mol^{-1}$ respectively,the above solution will freeze at ........... $^oC$.
DifficultAIIMS 2015
View SolutionWhen $1 \ g$ each of compounds $AB$ and $AB_2$ are dissolved in $15 \ g$ of water separately,they increase the boiling point of water by $2.7 \ K$ and $1.5 \ K$ respectively. The atomic mass of $A$ (in $amu$) is $........ \times 10^{-1}$ (Nearest integer). (Given: Molal boiling point elevation constant $K_b = 0.5 \ K \ kg \ mol^{-1}$)
Match the following.
List-$I$ List-$II$ $(A)$ Azeotrope $(I)$ $\Delta T_b = i K_b m$ $(B)$ Henry's law $(II)$ $p = K_H x$ $(C)$ Cryoscopic constant $(III)$ $\Delta T_f / m$ $(D)$ Van't Hoff factor $(IV)$ Deviation from Raoult's law $(V)$ $\pi = CRT$
The correct answer is
| List-$I$ | List-$II$ |
|---|---|
| $(A)$ Azeotrope | $(I)$ $\Delta T_b = i K_b m$ |
| $(B)$ Henry's law | $(II)$ $p = K_H x$ |
| $(C)$ Cryoscopic constant | $(III)$ $\Delta T_f / m$ |
| $(D)$ Van't Hoff factor | $(IV)$ Deviation from Raoult's law |
| $(V)$ $\pi = CRT$ |
The correct answer is
The elevation in boiling point for $1 \ m$ solution of non-volatile solute $A$ is $3 \ K$. The depression in freezing point for $2 \ m$ solution of $A$ in the same solvent is $6 \ K$. The ratio of $K_{b}$ and $K_{f}$ i.e.,$K_{b} / K_{f}$ is $1 : X$. The value of $X$ is [nearest integer].
$P$ and $Q$ combine to form two compounds $PQ_2$ and $PQ_3$. If $1 \ g$ of $PQ_2$ is dissolved in $51 \ g$ of benzene, the depression of freezing point is $0.8^{\circ} C$. If $1 \ g$ of $PQ_3$ is dissolved in $51 \ g$ of benzene, the depression of freezing point is $0.625^{\circ} C$. Given $K_f$ of benzene $= 5.1 \ K \ kg \ mol^{-1}$, calculate the atomic masses of $P$ and $Q$.
DifficultWBJEE 2025
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