Q74 / 200 · NEET 2023 (Manipur) · Chemistry

Which amongst the following aqueous solutions of electrolytes will have minimum elevation in boiling point? Choose the correct option.

  • A
    $0.1 \mathrm{M} \mathrm{MgSO}_4$
  • B
    $1 \mathrm{M} \mathrm{NaCl}$
  • Correct answer
    C
    $0.05 \mathrm{M} \mathrm{NaCl}$
  • D
    $0.1 \mathrm{M} \mathrm{KCl}$

Solution

$\begin{array}{ll}\text { Solution } & \text { Moles of particles in } 1 \mathrm{~L} \text { solution } \\ 0.1 \mathrm{M} \mathrm{MgSO}_4 & 0.2 \\ 1 \mathrm{M} \mathrm{NaCl} & 2 \\ 0.05 \mathrm{M} \mathrm{NaCl} & 0.1 \\ 0.1 \mathrm{M} \mathrm{KCl} & 0.2\end{array}$ Lesser is the number of particles, lower is the elevation in boiling point

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

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