Q74 / 180 · NEET 2025 · Chemistry

Which of the following aqueous solution will exhibit highest boiling point?

  • A
    0.01 M Urea
  • B
    0.01 M $\mathrm{KNO}_3$
  • Correct answer
    C
    0.01 M $\mathrm{Na}_2 \mathrm{SO}_4$
  • D
    0.015 M $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$

Solution

$\Delta \mathrm{T}_{\mathrm{b}}=\mathrm{i} \mathrm{~K}_{\mathrm{b}} \mathrm{~m}$ - Consider $\mathrm{m} \approx \mathrm{M}$ - $\mathrm{K}_{\mathrm{b}}$ same for all $\mathrm{i} \times \mathrm{M}$ (1) $1 \times 0.01=0.01$ (2) $2 \times 0.01=0.02$ (3) $3 \times 0.01=0.03$ (4) $1 \times 0.015=0.015$ $\mathrm{iM} \uparrow \Rightarrow \Delta \mathrm{~T}_{\mathrm{b}} \uparrow \Rightarrow \mathrm{~T}_{\mathrm{b}} \uparrow$

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

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