Which among the following solutions has minimum boiling point elevation?
Which among the following solutions has minimum boiling point elevation?
- $0.1 \mathrm{~m} \mathrm{NaCl}$
- $0.2 \mathrm{~m} \mathrm{KNO}_3$
- $0.1 \mathrm{~m} \mathrm{Na}_2 \mathrm{SO}_4$
- $0.05 \mathrm{~m} \mathrm{CaCl}_2$
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.
Asked in: MHT CET 2023 (12 May Shift 1)
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