Q26 / 150 · MHT CET 2023 (12 May Shift 1) · Chemistry

Which among the following solutions has minimum boiling point elevation?

  • A
    $0.1 \mathrm{~m} \mathrm{NaCl}$
  • B
    $0.2 \mathrm{~m} \mathrm{KNO}_3$
  • C
    $0.1 \mathrm{~m} \mathrm{Na}_2 \mathrm{SO}_4$
  • Correct answer
    D
    $0.05 \mathrm{~m} \mathrm{CaCl}_2$

Solution

$$ \mathrm{NaCl} \longrightarrow \mathrm{Na}^{+}+\mathrm{Cl}^{-} $$ Total ions $=0.1+0.1=0.2$ ions $$ \mathrm{KNO}_3 \longrightarrow \mathrm{K}^{+}+\mathrm{NO}_3^{-} $$ Total ions $=0.2+0.2=0.4$ ions $$ \mathrm{Na}_2 \mathrm{SO}_4 \longrightarrow 2 \mathrm{Na}^{+}+\mathrm{SO}_4^{2-} $$ Total ions $=0.2+0.1=0.3$ ions $$ \mathrm{CaCl}_2 \longrightarrow \mathrm{Ca}^{2+}+2 \mathrm{Cl}^{-} $$ Total ions $=0.05+0.1=0.15$ ions $0.05 \mathrm{~m} \mathrm{CaCl}_2$ solution has minimum ions in solution, so it shows minimum boiling point elevation.

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

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