Observe the following statements:Statement-I: | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Statement-$I$: The elevation in boiling point $\Delta T_b$ is given by $\Delta T_b = i 	imes K_b 	imes m$. For $0.1 \ M$ urea (non-electrolyte),

Vedclass · Accepted Answer

Both statements $I$ and $II$ are correct

Vedclass · Answer

(A) Statement-$I$: The elevation in boiling point $\Delta T_b$ is given by $\Delta T_b = i 	imes K_b 	imes m$. For $0.1 \ M$ urea (non-electrolyte), the van't Hoff factor $i = 1$. For $0.1 \ M$ $KCl$ (electrolyte), $KCl$ dissociates as $K^+ + Cl^-$, so $i = 2$. Since $\Delta T_b \propto i$, the boiling point of $KCl$ solution is higher than that of urea solution. Thus, Statement-$I$ is correct.Statement-$II$: Elevation of boiling point is a colligative property. For a given mass of solute $(w_B)$ in a fixed mass of solvent $(W_A)$, the molality $m = \frac{w_B 	imes 1000}{M_B 	imes W_A}$. Since $\Delta T_b = i 	imes K_b 	imes m$, we have $\Delta T_b = i 	imes K_b 	imes \frac{w_B 	imes 1000}{M_B 	imes W_A}$. Thus, $\Delta T_b \propto \frac{1}{M_B}$. Statement-$II$ is correct.

Similar Questions

The addition of a polar solvent to a solid electrolyte results in

$0.5$ molal aqueous solution of a weak acid $(HX)$ is $20\%$ ionised. If $K_f$ for water is $1.86\, K\, kg\, mol^{-1}$,the lowering in freezing point of the solution is $........ K$.

Calculate the van't Hoff factor $(i)$ of a centimolar solution of potassium ferrocyanide $(K_4[Fe(CN)_6])$ if it is $60\%$ dissociated at $300\text{ K}$.

$A$ $0.5 \ m$ aqueous solution of a weak acid $(HX)$ is $20\%$ ionized. If $K_f$ for the solvent is $1.86 \ K \ kg \ mol^{-1}$,the depression in freezing point of the solution is ..... $K$.

$17.4\% \text{ (mass/volume) } K_2SO_4$ solution at $27^\circ C$ is isotonic to $5.85\% \text{ (mass/volume) } NaCl$ solution at $27^\circ C$. If $NaCl$ is $100\%$ ionized,what is the $\%$ ionization of $K_2SO_4$ in aqueous solution? [Atomic weights: $K = 39, Na = 23, S = 32, O = 16, Cl = 35.5$]

Vedclass Test Series

Exam Paper Generator

Online Exam Module