Q3 / 110 · VITEEE 2024 · Chemistry

The boiling points of 0.01 M aqueous solution of sucrose, NaCl and $\mathrm{CaCl}_2$ would be

  • A
    highest for sucrose solution
  • B
    same for all
  • Correct answer
    C
    highest for $\mathrm{CaCl}_2$ solution
  • D
    highest for NaCl solution

Solution

Sucrose $\longrightarrow$ No dissociation $\begin{aligned} & \mathrm{NaCl} \longrightarrow \mathrm{Na}^{+}+\mathrm{Cl}^{-} \\ & \mathrm{CaCl}_2 \longrightarrow \mathrm{Ca}^{2+}+2 \mathrm{Cl}^{-}\end{aligned}$ Elevation in boiling point is directly proportional to the number of particles and $\mathrm{CaCl}_2$ solution contains more number of particles. Hence, $\Delta T_b$ will be maximum for $\mathrm{CaCl}_2$ and so will be the boiling point.

Hence, the correct answer is option: 'C'.

More Solutions Questions