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(B) The boiling point elevation is a colligative property,which depends on the number of particles (van't Hoff factor,$i$) in the solution. For $1\%$

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$1\%$ solution of sodium chloride in water

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(B) The boiling point elevation is a colligative property,which depends on the number of particles (van't Hoff factor,$i$) in the solution. For $1\%$ solutions,the molarity is approximately the same. Glucose $(C_6H_{12}O_6)$ and urea $(NH_2CONH_2)$ are non-electrolytes,so $i = 1$. $NaCl$ dissociates as $NaCl \rightarrow Na^+ + Cl^-$ $(i = 2)$. $ZnSO_4$ dissociates as $ZnSO_4 \rightarrow Zn^{2+} + SO_4^{2-}$ $(i = 2)$. Since the molar mass of $NaCl$ $(58.44 \ g/mol)$ is lower than that of $ZnSO_4$ $(161.47 \ g/mol)$,a $1\%$ solution of $NaCl$ contains more moles of solute per unit volume than a $1\%$ solution of $ZnSO_4$. Therefore,the $1\%$ solution of $NaCl$ has the highest number of particles and the highest boiling point.

Column-$I$	Column-$II$
$A$. Beckmann method	$1$. Osmotic pressure
$B$. Ostwald-Walker method	$2$. Elevation in $B$.$P$.
$C$. Berkeley-Hartley method	$3$. Depression in $F$.$P$.
$D$. Landsberger method	$4$. Relative lowering of vapour pressure

Which solution will have the highest boiling point?

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